It's all about data collection and metrics. Given how bad many of them are, I suspect many of the authors of the preloaded apps don't actually care if the user

It's all about data collection and metrics. Given how bad many of them are, I suspect many of the authors of the preloaded apps don't actually care if the user ever interacts with them. It's trivial to uninstall a 'normal' app, but disabling it (to the extent possible.. some of them are pretty nastily embedded) is something that most users likely aren't even aware is possible.