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Pre-NGE and CU...
I dont know how it will be in Repopulation but please copy those things I found are one of the best features of the game.
2. ressource gathering (one of the best ever!)
3. armor system (no best armor for everything)
4. damage system (to red, green and blue) combined with the armor system
there are/were a lot of other cool things, but those were the best in my opinion, and I dont know why, ANY other game since then copied that.
why do you make the housing instanced? is it a technically thing? if so, i understand it, but much cooler would be, if everything is just open without any instances (you can lock your door of course and give keys to your buddies)
i know you cant change anything about the combat system, but would be cool if its something more dynamic, like TSW (where you can move always and dont have to stay still watching a cast bar) or other more dynamic systems.
make everything you wear to be visible on your character.