I have both and use them simultaneously, lol. I described the Terminator in my previous post about the Linux, and some other things too. I don't like too many apps on my screen, and laptop is heating enough w/o a few too many.
As for the email I have Geary which I don't even use, and my fav mail is Proton and Disroot, on mobile.
This gmail method is for sending fast w/o wasting too much time.