I tried it quickly in Chrome, but if fails for me. Possibly it clashes with some other gadgets or such I have, but what happened is that on talk pages I couldn't find the signature button (I don't know where it is hidden in the Visual Editor menu). Also, it disabled the synatax highleter I find very helpful for code editing. So I am not sure what this is supposed to do better - I use visual editor sometimes, but at the very least this shouldn't cripple code editing and hide signature buttons.
Topic on 2017 wikitext editor/Feedback
The "Your signature" button appears under the "Insert" drop-down menu, and the "Syntax highlighting" button appears under the Menu icon (three horizontal lines) drop-down menu.
The Visual Editor suffers from the same drop-down menu scavenger hunt issue found in other WYSIWYG editors. The developers might want to rearrange things more intuitively and give greater prominence to the signature button on talk pages.
The design theory is that nothing moves around in the toolbar. Some things might be grayed out/disabled, but nothing changes places. This means that once you know where to find it, you always know where it is.
That idea is from 2012 (approximately?), so perhaps it's due for reconsideration.