All my passwords and SSH key are already in Bitwarden. When a site starts supporting passkeys, I add that to Bitwarden as well. Now, instead of logging in by auto-filling my username and password, I just press the passkey login button (that hopefully exists) and click on the Bitwarden popup to select the account. It's less button presses for me, and I cannot be phished, nor can my passkeys be leaked on the dark web. All thanks to some fancy cryptography.
Okay, sure, if someone steals my Bitwarden vault by snatching my laptop while it's unlocked or something, I end up pretty screwed. That security aspect did not change, so I still use TOTP for all important services.
Also, I've made one invite-only web app where single-use invite codes and passkeys are the only ways to log in. It was not too hard, it was fun, actually. And I get the peace of mind that account sharing is pretty much impossible were a bad actor able to get their hands on an invite, as is hacking other people's accounts.
(Okay, I concede that I've had to help multiple people who find passkeys confusing as a result of this whimsical decision, and that it just might be that nobody is using my web app for real. So I'm just speaking from nerd privilege here... But it works well, trust me!!)