I replied to a similar post on Reddit, but the trade-offs Razer has made to get those specs in that chassis are such that Apple won't do it. They run hot and loud. Apple doesn't care about gaming enough to be OK with shipping a machine that is loud in a traditional business or classroom setting.
I had both the 2014 and 2015 Blades when they came out, and ended up returning for those reasons (they claimed it got better with that newer generation, but it was the difference between a Boeing and a Cessna taking off), as well as generally poorer quality control than I experience with Apple.
Yeah...those are always the trade offs. But for students like me, these 2000€+ prices are a huge investment and I just want to be sure that I get a laptop which, performance wise (4k editing) will not be obsolete in a year or two. And there's quite a difference between these GPU's.