Apple removed the Home button after 10 years in the iPhone X and replaced it with a little bar drawn in software at the bottom of the phone. Just like users will learn new behaviors to exit apps, they will learn that the control center behaves in a new way.

Nobody cares about this other than technical people, who really only care because they perceive it to be Apple Arrogance. Nearly 40% of the installed base is on iOS 11, if there were complaints about this we'd have heard about it by now (just like we hear about everything else).

Tech blogs and the EFF might write about it, but aside from the HN threads about it, no one in the real world will ever care because the change is an improvement over what it used to do.