That's true today if you use a password manager, no? And it's true of any site that uses 2FA (unless the site supports multiple authenticators and you have a backup token).
I also usually carry my passport as a backup though that probably won't work if I need to rent car--and on that particular trip it was a last minute overnighter so I didn't throw in my backup documents and cards folder. It took me about half an hour to convince the hotel to let me check in.
In general, I hate traveling with things that you really can't afford to lose and can only mitigate against loss to some degree.
This could be resolved using a FIDO enabled NFC sub-dermal implant.
The simple fact there no guaranty of safety that can be made about such a system despite its obvious consequences about tracking, power and control should alone be a red flag.
When I read such a comment, I can't help but think school should make kids read more science fiction. Many authors covered why something like this is a dangerous idea.
I'd go even farther, but I would reach the Goodwin point.
I have a password manager, protected by a strong, unique, randomly-generated master password that I took the time to commit to memory. I cannot ever loose this password, and as long as I have it, I can get into my vault. As long as I can get into my vault, I have access to my other passwords.
An increasing number of web services have decided this is insecure, and are forcing me to use secondary devices in order to authenticate myself. This does very little to increase my security, while putting me at risk of getting locked out of essential resources.
I'm all for alternate options, but please don't take this setup away from me!