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Mozilla tried that once and failed. I really miss it. https://en.wikipedia.org/wiki/Mozilla_Persona

I assume other than phishing it's also the poor UX of switching to your email inbox and then back to the browser, which can be especially bad on mobile.

That being said, I like the idea and have asked myself that question before as well.

And yet many people are already doing that because of two-factor security codes many services use to make sure it's you.

If you mean login through email link, firebase auth provides a very easy implementation of it.

You can do this for logging into Slack IIRC (might be mobile only?).

Slack’s magic link works on mobile and desktop.

Doesn't Medium do this?