Isn't it basically the same reason loads of things will have sizing options along the lines of medium/large/massive instead of small/medium/large. At this stag

Isn't it basically the same reason loads of things will have sizing options along the lines of medium/large/massive instead of small/medium/large. At this stage I'd say "Pro" in terms of Macbooks is is more likely to be for people who want something more powerful or a bit fancier than an Air than people who need something more powerful, so there needs to be another level above that