What features HAVE to be in the next Battlefield game for it to be good?

It is far too late to ask for the impossible. Meaning making changes to the concept and adding things that they call 'legacy' and we call 'essential'.

But there are a few things they surely can at least LEAVE OUT. Say, like the 128 player nonsense and specialists.

Not sure why there is still hope that they can create a good game that brings back the good old BF spirit and core gameplay mechanics, enforces teamplay, etc.

But there is least one thing that WE should make sure the next game does not get. Our money in the form of any pre-order until the game is really out, all lies from the trailers exposed and has been tested by real players or at least streamers that you can watch the gameplay of for a decent amount of time.