It makes sense for a work device that is off network/domain, but then it is your primary/only means of interfacing with services. Then you can consolidate under a Windows Hello passkey or something else.

The second you have a second device to log in from they are useless. The second you want or need to share a credential (smart or not) they are more work than a password.

The passkey trend seems lead by platforms that want to make it easier to get or stay logged in, Netflix type companies that want to prevent account sharing, and those that value convenience (if one device) over security.