How is this any different from what you have on your phone? If someone hacks your phone they have access to all your email, whether you have 2fa set up or not.

How is this any different from what you have on your phone? If someone hacks your phone they have access to all your email, whether you have 2fa set up or not. If someone hacks your computer in this case then they also get access to all your email. The thing that 2fa is good at is preventing hackers from logging in if they guess or find out your password. If your device is compromised then everything you do on it is vulnerable, no matter how many factors you have.