You might want to post this in the Resolve section and not in the Post section.
A lot of the things you cite are all covered in the manual. I agree, some of the UI issues made me do a double-take, and some of the changes are (ahem) unusual, but the program does essentially work.
A few things are deal-killers for me, but I'll wait a while before posting that list. I did a 4-minute project last night without any major issue, and am about to start on a 14-minute short in a couple of days. We'll see how it goes.
BTW, there is a button to expand the viewer. Upper right. What I haven't found yet is a keyboard command for it.