I agree that mac is overpriced. But making all parts disposable is good for environment, and thus this should be encouraged. So if this is the reason keeping you away from mac for gaming, I would keep silent.
The fact I think is apple is not eager to design a well performance cooling system, which would break their design a lot. Forcing to throttle device would surely impact application performance.
Apple doesn't make all parts disposable, and by no means did I mean that as a compliment. What I mean by disposable is essentially this;
You buy any current apple computer. Any single part of the computer proves to be dated and you need to throw out the entire computer. Disposable. That's terrible for the environment. Instead of allowing users simply upgrade their computer's parts whenever necessary, Apple forces you to chuck the whole thing.
Disposable, essentially making macs 'one time use'.