The new focus mode seems well-executed, but it's refined so much as to be completely pointless. The next logical iteration of this feature would be to put everything back on the screen at all times so you have easy access to it.

The off-center editor doesn't look great, and, well, what problem is this solving? Right now, my eyes can see a window, a closet, a few posters, a desk, a notebook, a bed, two bookshelves, a fan, and a computer screen. On the computer screen is a toolbar and an open window. The new focus mode hides a couple things in that window, because while my brain is perfectly OK ignoring everything else, it apparently might have a hard time with a few meta boxes.