(...)
there is some sense in this claim given the amount of viruses in phones is definitely lower than in computers, but it doesn't mean you can't get virus in phone and it's safe in general
What about the 2FA which gives the additional vector attack for phones, compared to computers? I'll explain: phones can be used as 2FA devices what means that the attacker can control the second authentication channell too.
Anything is secure as you make it out to be. You can lock your Google authenticator (or whichever app you use) with fingerprint or something? Enable remote wipe so even if you lose phone you can clear its data so thief can't steal anything from your phone.
And of course keep those 2fa keys secure somewhere to avoid headache later on.