(My user page on en.WP discusses my limitations to some degree.)
Since the 1990s I've seen many tools migrate from text-based interfaces to graphical ones, and not always with good results for various sets of users with various disabilities. I've just used this editor, and it did not surprise me. It significantly increased the amount of mouse clicks I was forced to use to complete a task.
(Side note: Clicking Publish... to get to Preview... is right up there in awkwardness with Windows' Start > Shut Down.)
One of the reasons I wasn't surprised was because of the careless usurpation of Alt-Shift-V. Even though as of the time of this post it still is in the tooltip on en.WP if you hover over the Show changes button, the shortcut's function is now to switch you to the Visual Editor.
There is at least one bug about this, but if you look at my en.WP user page, you might get some understanding of why, when I found it had been closed or had been given some such status, I didn't try to figure out how reopen the issue. I have to do what I can, when I can. I was discouraged and out of when-I-can.
So now I have to use what hotkeys I can simply to get to that button's location before wasting an incrementally pain-filled mouse click on it, and I use that view often to make sure I don't upload the wrong thing after, say, passing out or a stillsdisease.org fever spike. And right before I click, I get irritated by a tooltip that still shows me how I used to check my [V]ersion before saving it by comparing it with the previous [V]ersion.
It's like a poorly-formed curb cut: you don't notice it's a problem unless you have to push overly hard against it to move on when it's supposed to be there to help you move on in the first place.
Thank you for all your hard work in general, your patience with my irritated tone in this post, and your consideration of how to make this tool in particular less mouse-click dependent for those of us who are rodent-impaired. I'd consider help on the Alt-Shift-V problem a bonus.
I will try to take notes the next time I use the 2017 Wikitext Editor so the bulk of my feedback's details on this page can be on what this page is actually about. Heh!