> I'd never trust and install a 3rd party app on such a device that I carry around with me every day.
I don't run any third party apps either. But I like that I am welcome to do so. In the past I have installed apps from third party developers that I trust and am the better for it.
I want to install apps though (and I actually do). Just those that makes economic sense for developers so that they won't want to resort to scams and even if they decided to, they wouldn't be able to. Apple's ecosystem provides that. I do run 3rd party apps on my Apple mobile devices and accept that there are reasonable vetting procedures at the human and OS level to protect my privacy and protect my device from malware. Android model unfortunately does not provide that, that's why I wouldn't install such apps in such a device.
I don't run any third party apps either. But I like that I am welcome to do so. In the past I have installed apps from third party developers that I trust and am the better for it.