There is not much to say yet about passkeys except most are fully locked into their own service. Proton is the first one I've seen with an export option. Thing is there is nowhere to import yet except back into Proton. Only thing I don't see on Proton Pass is Identity that Bitwarden does, but Pass does have aliases.

I actually started paying for ProtonVPN after migrating from ExpressVPN. Then upgraded to Unlimited so I could add my own domain name for email and sync my mails offline.

I'm also contemplating going all in on Proton Pass. Want to test how the form fill works as I've been having some minor issues with Bitwarden not fully filling in credit card info, but it may be to do with the sites too. Still Bitwarden is highly configurable. I'm just interested now that Pass has passkeys and for mobile too.