Passkey is some sort of specific unique key to a device allowing to use a pin on a device instead of the password. But which won’t work on another device.
Now I don’t know if that key can be stolen or not, or if it’s really more secure or not, as people have really unsecure pins.
That’s why they invented chargers, eh.
But more seriously, there are recovery procedures if you lose a phone with or without a backup and if you are willing to share the keys with a cloud provider, you can also store them there and use them on any of your devices.
Or you can get something like a yubikey if the battery aspect is really that problematic for you.
The fact is that I fail to see something obviously wrong with outrageously long/complicated passwords managed by e.g. Bitwarden or the likes.
Bitwarden is also supporting passkeys, so it won’t make a difference for their users whether they use passwords or passkeys.
And the fact that you don’t see anything wrong is more a you problem. Boomer mentality, dude. Don’t became one.
Boomer you mom, idiot. Fuck off.
It would probably be better for you to explain what’s wrong and not just call them a boomer as if that explains it.