So you want steam to just grab mods off nexus and upload them to the workshop without the modders approval?

It is impossible to upload majority of currently popular mods to Workshop, due to it's limitations.

Workshop previously suffered from constant errors and file data losses. This caused many authors and users to pull back from it. Now things have settled down, but mostly because Workshop is no longer under notable stress, due to reduces user numbers.

No one is managing this platform. BGS pulled completely away after Curated Workshop. Skyrim Workshop lives on Steam updates to main system. Nothing is being done otherwise.

Skyrim SE got compiler update last year. Now it's scripting engine works far better than before, in addition of x64 architecture benefits for memory management. After the dust settled down, pretty much every notable project is no aimed at SE.

I understand that Workshop remains easy to use for many. Keep using it, if you wish. But most mods go to Nexuus, due to limitations, and most notable new projects are made for SE, due to memory, VRAM management (ie: not needed, like for old version of the game) and script performance benefits.

understand but if they were also uploaded by steam we would have more opportunity to use those mods

most nexus mod developers don't want their mods on Steam; most mod developers don't want to deal with Steam. Steam isn't very supportive of mod developers and the Steam Point system makes matters worse...Steam told it's users not to donate to mod developers...to go out and buy new games instead...Steam won't let most mod developers list any type of links...Steam got mad at me for distributing a newsletter to 20 people telling them how to get free games (all of these people asked to be put on this list)..and then there's the inconsistency...Steam let's certain people do certain things and restricts most...Steam monitored my private chats and got mad at me for telling 4 to 5 people how they could get Morrowind and Oblivion for free when Bethesda was running a special promotion (Steam was still selling it)[none of people were mad at me...it was just Steam yelling 'How dare you'] and the list goes on...Steam just isn't a good environment for most mod developers.

Yeah I could have brought over things like WARP and World Encounters but that requires links...and we all know that Steam doesn't like links...besides I have to worry about them getting mad at me...issuing warnings and banning me for a day or week.

Who wants to work in a environment like that ? No-one...

but then what's the use of buying the game if I can't use the mods that are updated on steam if that's the point of buying the game all the mods is very important use

Trust me I tried...ask anyone.Valve used to come to my rescue but I guess they got tired of it...and after a while so did I.