We explained way back in 2014 why you might want to have an Apple ID recovery key. In those days, it was an extra precaution you could take against getting locked out of your account.
Apple abandoned recovery keys when it switched to a smarter two-factor authentication process, before reintroducing them in a new form in iOS 14. However, they now work in a different way. You definitely won’t want to enable one now, and you may not want to do so ever …
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