Hardware security models aswell as the security design in general of mobile devices is way more secure and battle tested compared to the currently available hardware wallets.
Maybe that is the case but they only have security updates for few years at most, I think apple has 5 years, samsung flagship devices has 4 years, cheap phones 1 or 2 years, and than they become unsecure.
Since Airgap wallet is based on older device, that means that most of those devices are generally unsecure.
The knox lockdown performed is one step deeper than what is offered to the user through i.e. settings. Also user errors (i.e. accidentally turning on wifi) are taken care of by the lock down.
So is there a way to revert changes to default state with Reset phone function, and remove AigGao later?