If you want the platform to be x86 but not AMD then your only other choice is Intel, but they've only recently started making high performance GPUs. So then you need another vendor for the GPU, and your only choice is Nvidia.
A lot simpler, cheaper and predictable to go with a single vendor for both I imagine?
They tried to push the same into the desktop market with their APUs, where it was mostly ignored. But console games only target a couple hardware configurations, making it viable to take advantage of such hardware features
Consoles are always pressured to minimize upfront purchase costs, and they generally replace the vendor-provider SW stack with their own anyways.
Actually looking at this thread, there’s a lot of good reasons they were the go-tos for consoles. Consoles seem to be in rough shape at the moment, I wonder if part of that is that AMD has been doing too well since Zen, haha.
Nvidia never cared much for those types of deals. They preferred to lose Apple as a business than to admit fault, they’ve always refused to compete on price for the business of Sony and Microsoft’s consoles. They’re adamant to beat at the sound of their own drum.