In general gamers probably use desktops more often than laptops, so Macbooks aren't really a very good use case. Laptops are overpriced and unless you have a good reason to pay for the mobile factor, you can save money while getting better specs in a custom built desktop computer.
That said, Linux distros can vary and rolling distros update often, but if some game targets the stable version of some distro it usually works OK. GOG for example support Mint and Ubuntu.
As I said in my previous post, not all those who play take a computer on purpose to play. It seems logical to the contrary.
To date, it is quite possible to play on laptop. Furthermore, the mobile factor is very important. I'm not just talking about those who absolutely need (eg academics) I also speak for everyone else. How many people nowadays prefer the tablet or smartphone to your computer? Just answer this question to understand how the mobile factor is important.
It is clear that for the same specifications a custom built desktop computer will cost less, but it is also clear that only those who have in mind to use the computer only at home and mainly as console will accept such a thing. Personally I prefer a laptop that can also play graphics media and pay more, rather than a desktop with whom to play ultra graphics and pay less. Simply because it is not only important play, everything else is done without problems, even the hardware of a air 11 ''. Indeed, if it were not for the cost of video games and the fact that with the gamepad I can not play, I'd rather take a console, that nowadays I understand they have a hardaware less than some laptops.
You can not play on ultra graphics laptop, but that does not mean they do not go well. Finally were done thousands of games in the past, many of them very beautiful, that no longer require an ultra computer, it is clear that even with a laptop you can easily play the games come out until a few years ago at ultra graphics.
Gog supports linux only a few months, the reason for this delay compared to mac is clear, 99% of the games on linux porting are made with wine, there are few developers who are able to support linux and the problem is just the sheer amount of distro.
It is true that for mac native games there are not many but they exist.
For linux not, because almost always on linux you have to release the source code which is not all developers want to do. In spite of ideologies also the fact of forcing developers to release the source code goes against the freedom of the developer.
It also seems clear that many games are currently available or only for windows, or for windows and mac or for windows mac and linux.
There are no games just for linux, or just for windows and linux.
I am convinced that the reason why the Witcher 3 has not yet been announced for mac has nothing to do with opengl, specific mac etc. ... I am convinced that they have delayed the launch (again hypothetically because they have not announced anything) simply because they are convinced that even a year after release is a valid option. Too bad that in this way all the waiting will be waning and only those who really expect that game will buy it, also the gain will be much less than a year after ... (eg on gog I've had the witcher 1 and 2 together with another game cost less than $ 5. the witcher 3 for mac, I'd pay € 43 as required (which are more than $ 43) in my account gog. But if it release it a year later I will pay much less).
The only reason why I'm writing in this forum although I'm not an avid gamer (both the witcher I've finished very recently, in the normal mode 1 and 2 easy), it's because I like their philosophy of DRM free.
If it were not for this I care nothing of when or if the game comes out. If it came out just a year after I'd buy it a year later statement, if you do not come out for mac expect a good wrapper. If you do not come out a wrapper and, as in this case, the game I would just try it, it would play in the virtual. And if the game does not work it would play. They leave hundreds of games each year, and there are many good games. For the history of the saga of the Witcher, there are also books (I'm reading).
In short, the gaming is not just about playing ultra graphics at 60 fps fixed. What affects only the hardcore players. And only the hardcore gaming laptop refuses.
But as I understand it the hardcore players who refuse any os, which are not windows (because they have to change what you do not know, they are always to change their computer even if the update is only to play 3-4 latest headlines in ultra graphics, instead of high).
The point, however, is if they had announced the witcher 3 for mac I already spent € 43 for pre-order, so instead, if I take it, (maybe seeing the video on youtube I do not like it more) I will definitely be spending a lot less (less than half the price if it comes out a year later).
They also support multiboot, so you can have more than one OS installed there.