More and more of my internet accounts require 2FA nowadays, and most of them don't allow me to turn it off. It's mainly needed because of the people who don't use proper passwords, share them everywhere, and have a system filled with malware. Those same websites nowadays run a timer to kick you out after a few minutes of inactivity, which makes it even more annoying. To me, 2FA is just a hassle. I have old Gmail accounts that don't let me login with my password anymore.
This makes me truely appreciate the old fashed forums that just keep me logged in for years. A browser cookie is very convenient.

That being said: as long as it's optional, I'm not against it. But would it really help if someone gains physical access to my mobile phone?