I played A6 Polaris alot as PvE and i have to say there will be point where you just get stuck like king unable to make a next move and it becomes stalemate
I got few ideas to make Polaris more bearable
1 - Industrial Horde beacon : Tbh,everyone gets too bored just to make horde beacon for not much
2 - Vehicle with Devastator on it : I know you wouldn't want a handheld devastator but instead of using it on sentry,why not add a Vehicle that has Devastator putted on
3 - 12.7mm buffs : Nobody prefers to use N200 Brenter even on PvP i heard so why not give it a buff and change N200 Brenter to get a magazine than cartridge loading 1 bullet at time
4 - More improvised attachments : Even late game attachments can't cut everything so why not add recipes like Tactical Laser + K&R Hand Stopper + ???
5 - Explosive Slugs buff : i know there is a recipe that gives you 14x1 but thoose shots are 1 and reload and it takes alot to reload 1 explosive slug on shotguns exception of flare gun so why not make it 2x7 2 mags containing 7 shots
6 - Add maybe final update like in Elver? : I know Expeditions are the main story here but when you finish it,there is nothing you can do much,maybe add more story and if possible make
7 - Alternative Story Route! : What do i mean with that? Maybe instead of going to safezone and talk to Bernard,make Gasmask as fast as you can and go to the Penguin in deadzone and take quests from him but this path will block Bernards as Bernards path blocks that penguin's questline(Can even ask more evilish quests like get rid of Reginald?)
Bernard to go previous Expedition locations (possibly 3rd) make us able to visit there
That's it for now,i really hope to check my suggestions
Thanks for reading