My first thought (besides the fact that it seems to be working okay at first glace), is that it take many additional clicks to get access to all the posting tool that used to be there by default.
And when you click a second set of three dots, the other open toolbar goes away. So if you want to insert an emoji/image, you need to click 2 above. Then if you want to italicize something, you click 1 above and the emoji/image toolbar goes away. If you want to insert another emoji/image, you have to click 2 again, and so on.