IMAP can check for mail without downloading. But apparently Gmail doesn't support that.
You can do this the other way round. Use a local email client such as Thunderbird on desktop or FastMail on Android to check Gmail and any other email accounts you have.
Fine for some people, not at all equivalent for others. (I'm disinterested, fwiw, haven't used Gmail other than an alumni forwarding address for years.) It's not just a protocol change.
Outbound emails sent via "Send mail as:" using SMTP remain unaffected.
A migration is still possible, but needing to keep a client up and running to push up mails via IMAP will be a major painpoint.
I'm hearing about this for the first time from HN (not from Google). I don't like having Google randomly drop IT tasks on my plate, and the possibility that emails might just silently stop being delivered is nighmarish. Sigh.
satisfice•34m ago