It's borderline clinically delusional, this kumbaya myth where there is a world where all console manufacturers just share their bespoke software with one another, and everyone is loyal to everyone else, and nobody drastically undercuts anyone else.
Everyone produces the level of hardware they can, and everyone competes by pricing non-aggressively, and despite the fact that the gap in finances between hardware manufacturers being so big and the potential hardware spec differences between each product ending up significant, every single developer would still be more than happy to spend even more dev years ensuring that every game will run on a hyper-powered Microsoft machine, and also on a glorified tablet made by Nintendo.
Mat is a fucking moron. And people should stop listening to him.