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by LexGray 1211 days ago
At least for the Apple ecosystem 2FA is built into the iCloud Keychain so you can access it from multiple devices. While there are security implications, in general it is a good trade off that the Safari or apps will only offer to auto-fill on the matching site. For the general population it is a far nicer, safer, and faster solution than waiting for the matching SMS code to login.

The biggest downside is if the site isn't set up correctly it is a long trek into Settings to get the code and it makes the site seem less trustworthy.