@RaginSam For me personally, I was hoping I'd get to make my own soldier in 2042, alongside the now gone custom emblems there were in BF4, or Origin profile pictures like in BF1.
I am happy with removing weapon restrictions and some other things like the + menu. I am happy with how classes are now, having those 3 very specific class gadgets always available (I dunno if the medpen for assaults is quite right) and still giving you 2 choices.
A good chunk of the specialists at launch were annoying. The end of round quips were annoying and clashed with the tone. And you HAD to listen to them, no quitting while McBabyface is speaking unless you outright close the game. You still can't leave the match when it's ending, but at least no more quips and babyfaces.
Specialists have been improved, but I don't think it's unfounded to be afraid that what 2042 fixed might return unfixed in the next game, even if it's not specialists in particular. Hardline basically dropped BF4's visual recoil fix like a hot potato. How about the improvements Hardline added, like blue friendly incendiaries or purchasing weapons to unlock them? Map votes from BF1? We're 10 or so years past BF4 now and that visual recoil fix is needed more than ever. At least the objective and teammate icon size and transparency settings BF4 introduced have stuck around, but what else will stick around and what won't? Will we get a not-a-scoreboard again? Or will it be something new and fun, like getting kicked if you crouch more than once near a corpse or after killing someone?
At least Concord is its own original IP though, rather than making changes to an existing one for global contemporary modern audiences.