Ask HN: Why does Apple make you wait 4 days to set up 2FA?

I just had to update my Apple Developer credentials, because my old login ID was not an email address. No problems there, I went ahead and updated my ID. As part of the process, Apple offered me the chance to use 2 factor authentication for extra security. Seeing as I use this everywhere else, I opted 'yes' to begin using 2FA.

However, I was told that there was a 4 day waiting period before I could implement it. Sounded strange to me. I can understand a waiting period to disable 2FA, but to actually start using it? I don't see the security implications of not waiting, and I am hoping someone can explain some sort of compromise that I may be missing here.