I really, really hope that the fullscreen mixer will return, I have begged for this since the arrival of C8. I never had any issues with always on top plugins on top of the fullscreen mixer (also AOT) in C7, it is my favorite feature in C7.
Right now in C8 I have another bug, that I hope is addressed in the next update, see picture below. After some time of working in a project, it start to grow a black unused area below the arranger and the mixer that i cant maximize any thing to, stealing additional space. I didnt find anyother info on this bug. hj