Yeah, though hopefully there is some sort of warning (or setting that prevents sideloading when enabled) that makes her think twice. Or, you could perhaps make her a “kids” profile unable to install anything without permission.
Sure - but why? Part of Apple's value prop is convenience. This extra app store thing doesn't sound convenient for Apple's customers. Apple isn't trying to make life difficult for consumers, they do make life difficult for developers and others in the ecosystem in many cases - but it's almost always to make life easier for their end customers.
Then nobody will use them if Apple allows them. If they do it like Google, by default users cannot sideload or install alternative app stores anyway. It's opt-in. Why do you want to prevent people who actively want to do these things with their phones from doing them?
If Apple's goal is to make things as "easy" for people as possible, then they should just not have any app store at all. And they shouldn't offer different configurations. They should just release an Apple iPhone that comes however it comes and nothing about it can be modified. That would be super convenient!
>> Why do you want to prevent people who actively want to do these things with their phones from doing them?
I don't want to. I want Apple to make the decision. I want Apple to make 1000s of decisions for me around my phone. They seem to be good at it, at least with respect to end users.
And, no, a non-app store phone wouldn't be convenient. Uber is very convenient. So is my banking app. There are dozens of very convenient apps on my phone.