I have a different problem. My codes are sent to my iPhone, and I don’t have access to that anymore, so I can’t log in to turn it off. I signed out of iCloud, and now I can’t get to anything on my computer.
Thats my concern too. Loose a device and if you dont have another one handy or at all you are SOL. Recently my sons device was stolen and I was able to login to iCloud to find it and recover it. If 2fa would have been on that would not have been possible (afaik)