I haven’t heard any complaints about accessibility. Was it a usability nightmare? (Probably! I definitely winced looking at screenshots imagining all the moving targets.)
(On a system where you have the infinite Fitts width of the menu bar, it seems perversely insane to have these tiny shifting boxes that mess you around.)
They hid a few buttons in a tiny dropdown that appears on hover; They kept a completely useless clickable lock icon in the middle-ish of field so now there’s a little chance that, while trying to do any of the above, you’ll end up with a popup that you have to close instead.