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.
I don’t think that access to your personal data/email/files being dependent on a battery-powered electronic device is a great idea, to be honest.
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.