I think, more important that what is added in EA, is what will be added/changed for 1.0.
There are EA that aim to provide playable, constantly evolving experience. From what I understand BG3 is a testing ground. The fact that improvements aren't ported from live code into EA build doesn't necessary mean that those changes aren't happening. Who knows what is and isn't improving though.
Well, I guess it just needs to be a matter of faith, given that Larian simply isn't saying jack shit about it.