Personally I've had no problem with Burnham's development over the four seasons as she grows beyond her Vulcan upbringing (especially as flashbacks early in the series show her behaving even more Vulcan). I think each of the showrunners has generally gotten Burnham right.
The trouble is that every other character seems to have been on a journey to the same place, with every one of them now as sensitive as they are considerate, and painfully earnest. I've been watching Legends of Tomorrow at the same time, and those characters are just as much of a loving family as the Discovery crew, but they're so much more interesting to watch and so much more relatable because they can joke around and argue with each other. There's a joy in how they play off each other and a spark to their dialogue that just isn't there in Discovery in season 4.
Oh, I could've used Picard as an example instead. The characters in that are way way more interesting than Disco's s4 cast to me, to the point where I enjoy every episode just because I get to watch them interact. They're holding their show together, while Disco's characters have been holding theirs back.
Obviously this is all my own opinion, I'm just saying that anyone who has a problem with Disco's dialogue lately isn't alone.