So despite the MacBook Pro employing a lower pixel density than its more mobile counterparts, it still gets to lay claim to the Retina Display name. You hold a phone closer than a tablet, and you’ll probably hold a tablet closer to you than you would your laptop.
It has to do with how your eye works, and how you use your specific device.
So why are they still called Retina I mean, “retina screens” are just a marketing concept, but there exists real science behind the nomenclature.