Gmail view: standard | >basic HTML<This is one of the reasons I use it. I get in, catch up, get the hell out of dodge (close the tab), and then I don't have (yet) a(nother) gmail tab sucking up literally hundreds of MB of RSS.
Other than that, dunno. Desktop email clients have basically always been faster to use IMO, and setup has been borderline trivial ever since imap/smtp discovery strategies became common.
Makes sense as the protocol they use to talk to the server doesn’t support tags.
My hard disk crashes? No problem, everything is in the "cloud". My computer crashes? I buy a new one and am up and running in no time without installing too much.
I recently stopped using Slack because their web client started storing 600MB in local storage. If gmail did that too, it would be the last nail in the coffin. I absolutely do not want random (or not-random) websites using my computer to store their data.
New mail could be pushed using web push.
The problem is the outbox, how to send sent mail once user go online !?
https://mail.google.com/mail/u/0/h/
It loads almost instantly for me, and is quite quick to navigate.
I still nip into Gmail quite regularly, especially when I'm already in the browser or a tab is already open, but if I'm sitting at the desktop and need to compose an e-mail, at some point the default returned to alt-tabbing to Thunderbird.
No waiting around, no messing, blank e-mail window up on the screen as fast as I can hit CTRL+N.
Back when everyone switched to Gmail circa 2005ish, hitting CTRL+N quite probably meant a firestorm of random IO hitting a magnetic disk, on a machine with barely any RAM for cache. The equation has long since changed, and your reason to use Gmail might now be your reason to use a desktop client. Highly recommend giving it a shot