Yes, so a better question might be: Why bother with Macs at all?
They’ve already established mobile platforms as the predominant form of personal computing.
The bulk of Windows sales globally are to corporate accounts, adminstration, educational mass purchases and similar. These won’t switch to MacOS, (edu sales are actually gravitating ”down” to mobile platforms/Chromebooks), and nor will the core Windows gamers ever do so as their libraries can’t be transferred to MacOS, regardless of the cost of Mac hardware or the state of software support (which clinches the deal).
Apple is only capable of adressing a subset of the classical computing market. And they do, successfully harvesting much of the total profit margin of the personal computer market in spite of their small market share.
Gaming is just another form of entertainment, and people can get a fix of that particular opium for the masses through a lot of channels. While having a larger library would help MacOS for instance in the student demographic that jeanlain pointed out, it is not at all a given that it would make much of a difference overall.