You realize the Macs in question are in fact built the same as a intel PC, the difference being a special chip to identify the system so it can accept OSX. No sale.
There is a question of engineering choices... and superb engineering can make a big difference. You still speak from outdated information and are therefore ignorant of the modern Macs. I am not.
You sit here and complain about your brand new computer that cannot properly handle the latest operating system designed for it... and ignore an option that does more and runs that operating system, for which it was not designed for, flawlessly with the graphics cards yours is choking on. Does that make sense?