2FA does make this more complicated and in my case my password manager did not have 2FA, but TOTP with backup codes does let you store those backup codes somewhere else, while none of the passkey implementations I have seen (Fastmail, Amazon and Toggl) have an equivalent to the backup codes for TOTP. The fact that they still support password auth is probably their failsafe here, but this assumes that password auth continues to exist, which is contrary to to the goals of passkeys.
I can't speak to other passkey managers, but both Google and Apple have pretty thorough account recovery flows that work even if you lose 100% of your devices.
So yeah I think it would be way more surprising to me if this particular flow was bad. If anything it’s likely to be one of their _best_ flows, given their scale and how critical of a flow it is.
And given that they love to track users to serve them ads, it’s also very much in their (capitalist) interest to make sure users don’t get locked out of their accounts.
Or do you remember a 20+ random character string for each site and thus do not need a password manager?