Apple

But this is a tad ridiculous. Sideloading on Android has always been a thing, the average user has no idea what it is or how to do it.

Yes, it's safer within the app store. No, granny won't accidentally install something, you need to allow installs from the source, accept permissions, clear the "are you sure" security screen, then finally choose between install and cancel, before getting one last security screen, "app was downloaded from the internet".

The concept of security is correct, your anecdote is a false example of it.