I'm not even sure whether Larian still takes suggestions or not, but here it is anyway:
My wife and I started playing a multiplayer game together, which is loads of fun. But I want to also play alone, just cause I want more Divinity time.
The problem is - if I start a new game now, it will be exactly the same. Yes, different characters and possibly different decisions, but everything else will be the same - I'll know how many and which enemies are in every area, which quests to do and how to do them, etc.
I thought it could be really cool if some of those things would be random. For example, instead of always having 3 level 3 undeads, there can maybe be one level 5, or 4 level 2, etc. Basically it sounds to me like there's a challenge rating to each encounter, and you can randomly draw enemies to match that rating. I think this could work well for combats.
I'm not so sure about quests, and obviously adding content there is more more complicated, but maybe a pool of side-quests, out of which only some are picked each game. Maybe some quests can have alternative parameters (find X instead of Y, etc.).