Android auto definitely doesn’t work (I tried Calyx briefly earlier this year).
What also doesn’t work without a lot of finicky tricks is Google Calendar. I myself haven’t quite gotten rid of Gmail and my calendar in Gmail yet, and that was a big headache I was not willing to live without just yet.
Outside of those two things it served my needs but I did not try any of the Microsoft products so I can’t speak to those.
I’ve been looking for a new launcher. Though this one isn’t selling itself with no screenshots. I don’t use telegram, so I don’t know if there’s screenshots in there.
Edit: They posted screenshots in the Google Play page. Found them.