[myguysi]

This is how it’s been on iOS for years but I was pleased to find out yesterday that I can now remove those “built-in” apps from my home screen. Not sure whether or not they’re actually deleted or just hidden though.

Perhaps you’ll be able to remove them eventually...

[Veen]

When Apple first allowed users to "delete" Apple apps in iOS 10, they weren't deleted but hidden. My understanding is that in iOS 11 they are really deleted.

[MaxLeiter]

They're actually deleted. If you try to delete one it will warn you some functionality in other apps may be broken due to missing it as a dependency.