Sincerely, I do not know. The only thing I suspect is that the spacing needed to display the buttons related to this Feature seems to be the cause of the not very elegant new display of some plugins. But Steinberg is completely silent on this subject and does not seem to make it a priority. The question of aesthetics does not seem to be part of their concern either.
So, we might as well get used to the idea that from now on we’ll have to live with this inconsistent ugliness, at least for some plugins…