>There's part of me that asks, if AMD had an ARM core, if we would have all Consoles powered by AMD chips now. Nintendo likely bought into Tegra because it was an ARM core, and for better or worse their mobile stuff by the time of making that choice had 15+ years of proven ARM success (GBA, DS, 3DS) behind it.

AMD worked on a ARM core https://en.wikipedia.org/wiki/AMD_K12 but I'm not sure it would had work, they were never the best on the power consumption, so I'm not sure it would have been a good choice for the Switch.

The story about that AMD ARM core is that they were making it for Amazon. Performance was not good enough so it was canned. Amazon then went on to make their own chips called Graviton.