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There’s even a standard for doing this with WebAuthn.

WebAuthn is exactly what I thought of too... and hardly anyone is supporting it. In fact the only place I've seen it was Best Buy's website, oddly enough! Having yet another way to do this sort of authentication isn't going to magically make people start using it.

...which has effectively neither adoption not momentum to achieve adoption: https://sec.okta.com/articles/2020/04/webauthn-great-and-it-...

For better or worse, there are a large (and ever growing) number of Metamask users these days...

Absolutely, but let’s not pretend this is some magic technology that only cryptocurrency can solve. Nor is it clear cut that we’ll see adoption of wallet logins outside of crypto circles.

The web3 solution is significantly easier than webauthn, if what I read in the above article is to be believed.

There’s a trade off there though. There are also other standards. People should probably want their cryptowallets to be better secured than they are. But crypto is facing the same UX challenge which leads to a worse model with the same attendant risks as phishing passwords.

The point still is that logging in with public-key cryptography is not exclusively a technology supported by cryptowallets.

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