I think they started removing the 2fa feature for email. I also experienced the same thing only this week when I login with my blockchain wallet I was surprised that my wallet opened right away because i'm used to opening my email and waiting for the confirmation link. I stopped using authy before just because of this feature now I need to download it again.
No, blockchain wallet still has this feature, I just tried to open a new blockchain wallet to test this issue encountered by many people. I tried to login and received an authorized email then tried to logout many times with the same browser without changing my ip address, and yes I just logged in without confirmation link. But when I tried using incognito mode and different browser and now it requires a confirmation link so...