I can't even get into Dragon Age; I think it's probably one of the most boring fantasy games I've ever played, and I couldn't even finish Inquisition, but I do know what you mean when it comes to very barren environments with little to do outside of the occasional side quests. I prefer dozens of new side quests and locations to make the planet feel more alive--maybe the Dune Sea can actually feel like the Dune Sea and not the Dune Swimming Pool, and expanding the Shadowlands on Kashyyyk would be dope as fuck. We also need greater variation in NPC's wandering around. I know the limitations of the past, but they've got a chance to make NPC's much more unique in this remake and I hope they take advantage of this.
And the combat system is pretty bad; unlock Master Speed and Master Flurry and the game is hilariously trivial at that point. There's little strategy involved, though maybe people prefer it that way, and once you unlock the special moves to trivialize every encounter, it's just a boring grind all the way to the end for yet another boring final level. I would want one of the changes to be that you can get points you spent on your first class returned and placed into your second class; it's optimal for players to not spend many points so they can save them for the second class.
KOTOR II's protagonist and antagonists were so fucking cool that it's the only game I'd replay; if they fill in all the cut content and add even more, oh my god I'll get it day one.