yea it's fair that you can just use IMAP and sync before your trip then send after.

but I was on a flight, didn't have Gmail or Superhuman cached and could not get either to even load. I do suspect that if it were already loaded, Gmail probably would have functioned decently well.

still Gmail and Superhuman just seem...bloated. kinda cool to just have a simple, open source interface for the Gmail REST API.