[alwillis]

I'm too lazy to recall every detail, but it happened, often.

Uh huh.

Last exemple I have in mind is maps.

They're working with several providers, including Yelp, Open Maps and Garmin. I've submitted corrections and additions to Apple Maps; anyone can do it.

As far as tech is concerned, I believe metal is their own inhouse invention?

Metal is a set of APIs for developers; it's not customer facing. Most users aren't going to know which graphics API their software uses. Apple supported and uses OpenGL for a long time and it's still available for backwards compatibility I believe.