No need to imagine!
Remove all passkeys from your phone and laptop, then go somewhere overseas without any of those Yubikeys.
Have fun enjoy a "not truly problematic" scenario of getting your Yibikeys from "multiple locations" you don't have access to, while being cut off from your messengers, email, bank account, etc.
Bonus points for having your card locked or stolen at the same time.
Or, imagine the backpack with your passkeys devices being stolen on an overseas trip.
Again: pray tell, then what?