Indeed all may not like high magic worlds, but that doesn't make them unplayable
In fact, they are easier to play.
Some players and GM's like really big scope. Take Dragon Age for example. Really
big scope, saving the world from the Dark Spawn. Yet Dragon Age II was pawned as inferior by the majority, in no small part because they were only fighting to survive and succeed with their family in a city. A very limited scope must have been the reason because it was as limear as the first DA and the combat system had been improved (though the game was still to easy for mages imo, and lets not talk about the massive holes in DAII storyline).
Think of all the really good PC rpgs: their scope tends to be
BIG. Two reasons. One revolves around the satisfaction of base human desire and ego, being the best, being great, being powerful and respected. Crush my enemies, see them driven before me, and listen to the lamentation of the women. You know, the usual, even if it is 12 or so, and I find it no coincidence most begin the march into adulthood at about the age of 12.
Reason two is the simple and easy; combat is easy to code compared to subtlties of human intereaction. Fighting is a challenge that is easier for a GM to deliver than suspense, intrigue, story, plot, character personality and development beyond leveling up, which is of course a simple measuring stick of success. Who doesn't remember their highest level or most powerful PC (pun intended).
Yes, a tight controled low magic game requires a 15 year old mentality over 12, but 12 ain't all that bad!