[yellowapple]

Except if you're using e.g. Google Authenticator and you lose that phone, you've now lost your TOTPs. The most unhoused-friendly solution there would be to use something like Authy instead (which is another password to remember, but at least it makes it easy to recover your TOTP keys on a new device without needing the old one); next best would be to use something like andOTP which supports backups (but then you'd need someplace to store those backups, which introduces the same problems as safely keeping a phone on your person).

[UncleMeat]

The context for this post is a person who moves between countries frequently and therefore gets new phone numbers. This person has consistent access to the same phone.

[yellowapple]

The context of the overall post is the posted Twitter thread, wherein the specific issue is the phone itself being lost/stolen.