@872ab8e1 "Google's app for generating MFA codes syncs to user accounts by default. Who knew?"  They did announce this.  It was a new feature as of very recently.  It was a huge problem before because you had to jump through hoops to transfer 2FA syncs between devices.

Personally though, I do think I like the methods used in software like Aegis better.  It can save to a file I can load between devices.  Not perfect, but a better balance.