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That’s ok. You should have the option to use that UX.

I can tell you that any non-programmer on the planet would ever choose that UX over the “app-like” feel. I think we forget that most users are not programmers way too often.

I'm skeptical of that. Have you timed it in Chrome DevTools? E.g. when I hit 'c' on the keyboard to compose an email, it's effectively instantaneous.

I use a regular mail client on my computers and phone, and don't touch webmail with a ten foot pole. Google did it best, but it's still junk.