Just thought I'd offer some feedback after my first play through with HR.

I use a very mod heavy setup, so I'll start by mentioning the most important mods I used as regards the mod:

Thinking Spot (TS) (So you can probably guess what type of games I prefer...) played on naked brutality (or a custom version of it), Children and Pregnancy (C&P) (once my tribe is up and running I played quite an insular tribe with the vast majority of my pawns having been born into it), Hospitality (more on that later), and a myriad of other mods like Rimefeller/Rimatomics or other mods that add tech to research. I also employ a myriad of house rules depending on what type of story I want to play - I mentioned one of them above about how my tribe was getting new pawns, but I disallow myself from building some buildings that my mods add because I find them OP, but like some of the other things the mod offers.

So, first thoughts (apart from the simple fact that I really enjoyed the impact HR has):

TS complements HR extremely well - but I mention it in particular because it adds a number of new research nodes and when combined with other mods, then the library can get... rather large. Now, it may be that the server ameliorates this issue somewhat, as it can store all of the tech in a small space, but whilst the bookcase gives a research buff to the research desk, you don't really want to move those bookcases into storage. (Or even just to declutter your research/study area...) It would be nice if the server gives an equivalent buff to bookshelves for that reason.

Speaking of the server... it would be nice to have a way (other than dev mode) to either discard or stack databases of techs now that they can't be stored in bookshelves. Just a minor thing, but as you can't sell them once they are on the cloud there seems to be no point in keeping them, and even if you want to keep them they take up the equivalent space of half a book shelf of books currently! This may be an issue that's specific to me having researched a lot of tech before the server update came in, however. I must have had about 25 or 30 databases lying around that I couldn't store anywhere other than the floor. (Oh, as an aside, this doesn't seem to be compatible with non-specific HR storage solutions, as although I could tick the box for 'knowledge' in my deep shelves from LWM Deep Storage, none of the databases would actually get placed in them.)

As regards C&P, HR interacts with it a little oddly at times. You can (if you are weak willed) set your toddlers to study even if they are incapable of work (in C&P that is until they turn 3). That means your toddler can theoretically turn 3 and then almost immediately build you a nuclear reactor... :P

Whilst I found this amusing, it did bring home a wider point to me that a child should have some benefit from being born in a high tech colony compared to that of a tribal know-nothing colony. There's considerable science today saying that the earlier children get acclimatised to technology the better, and those who aren't acclimatised to it by 3 will have a harder time of life with tech than those who are acclimatised with it before then.

I'm not sure if going down the rabbit hole of trying to implement something that would be something you'd like to attempt, however. Maybe something simple, like a buff to a child's intellectual stat dependant on what tech level their colony is at might work? So neolithic (or lower) gives +0 whilst spacer gives +6 (say) to the child's intellectual skill. That would simulate the child's advantage when it comes to learning new techs and also offer some scaling for them as the game goes through the tech levels.

So from the above two points you've probably got an idea of the kind of game I play - research is slow, and I play a more generational game than a sprint to leave the planet. I may be unusual in this, I don't know, however... one thing I would really like to see is an ability to have more control over study speed. Currently the difficulty settings can slow down research or studying... why not go one step further, and put it in the hands of the player? Personally, for my style of playthrough, whilst the research speed was pretty spot on for me, I would have liked to slow down the study speed further (particularly whilst I was in late game). An ability to set a percentage study/research speed from 1 to 100% in the options would be a very nice addition imho.

As an aside, I thought HR meshed very well with mods that add late game techs, which can otherwise feel like they are all gifted to you at once with not much effort. It was a welcome surprise to me to find that a mod I had downloaded to play around with in late game after I would ordinarily have 'won' the game still felt like I had to earn the OP stuff.

Okay, a couple of specific mod interaction comments now.

I've had the damnedest time trying to track down a bug with Hospitality where my guests were stealing my weapons after practising with them. I still haven't been able to work out what is going on, mainly because of the difficulty in replicating conditions. I think it may be a combination of Hospitality and Simple Sidearms causing the issue, but I can't prove it.

Essentially, what's happened is that a guest has gone to learn weapons and picked up a whole plethora of weapons. It then learns one, drops it, and keeps the rest of the weapons in their inventory. I've caught my own colonists engaging in the same behaviour, at times, which is how I worked out what was happening. (My carefully stored masterwork sniper range of weapons which I was keeping stored to deal with psychic ships kept mysteriously disappearing and I finally tracked it down to guests engaging in this behaviour.)

One thing I would say is that come late game I didn't notice my own pawns taking a large amount of weapons, so it's possible this may have been fixed somehow, or else it's just because my pawns had already learnt all the weapons on hand and so weren't practising. I'll keep an eye out to see if it is still going on whenever I start a new game. I didn't want to report it as an issue as I can't track it down, but though it was important to at least mention it.

The other specific comment is as regards Rimatomics - because there is a specialised system for gaining new Rimatomics research, no HR changes impact upon it. That means that constructors can build buildings without any specific knowledge etc. I suspect that there's no easy way for you to cope with that, but again, thought I might as well mention it.

If anything else occurs to me of general feedback I'll let you know, but this post is already quite long enough!