As a service provider myself, I've evaluated and said "Nah" to passkeys - because it's simply increased Customer Service contacts I have to invest in, whenever a user changes or loses devices, or any of the hundreds of ways Passkeys are not portable.
And guess what, the Tech companies pushing this have zero liability for user login support or security breaches. It's always me. There is no need for me to work hard and spend CS contacts, to wall off my users to the OS or Browser vendor.
I'll simply do passwordless Email or SMS 2FA / Magic Links and own my users without the overhead of Customer contacts, thank you.