It is also not recommended to use 2FA on PC to verify stuff on PC. (Personally, I still do that for some stuff due to laziness, though…)
Basically, hacking/stealing one device should not be enough to get your stuff. Smartphones are relatively often compared to PCs. As long as you still have a secure password you need to enter, I wouldn’t care too much, though.
It is also not recommended to use 2FA on PC to verify stuff on PC. (Personally, I still do that for some stuff due to laziness, though…)
Basically, hacking/stealing one device should not be enough to get your stuff. Smartphones are relatively often compared to PCs. As long as you still have a secure password you need to enter, I wouldn’t care too much, though.