[bhargav]

If you delete cookies regularly, I assume you are entering your password regularly? Do you use 2FA on these sites? I assume you have to go through the motions each time. What makes clicking on these links more annoying? Some 2FA (or confirm your identity) is done through email still.

[sontek]

I'd expect most 2fa to be through an authenticator app (google authenticator for example), SMS, or a physical device like yubikey.

I don't think I've seen anyone use e-mail for 2fa. All the devices I listed above are in real-time through TOTP timings. E-mail is NOT in real-time.