If you choose to not be the target market for the kinds of developers that provide this mythical sort of web installation experience that doesn't really exist for Windows either, then that's your choice.
A Gentoo user should not be surprised that game developers are not catering to them.
Linux gives you the ability to shoot yourself in the foot. You should not then whine afterwards because you think your foot is bleeding.
If you want a Mac, then buy a Mac. Clearly you don't value the wide array of meaningful choices that something like Linux distributions offer. Don't destroy something just because you don't understand the alternatives.