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In terms of hardware, they're running on AMD x86 CPUs. AFAIK there isn't anything special about them, other than having a wider memory bus (they use GDDR5 as opposed to DDR4).

But it had a really thin OS layer, and everybody had virtually exactly the same box, so you could micro-optimize to the exact architecture. IMO it does fit the concept of "domain specific stack", it's just that homogeneity is one of the important properties of the stack instead of unbridled performance.

the current Xbox is running a Windows 10 (one kernel design) while the PS4 run a patched up FreeBSD.

Only Nintendo bothers with writing custom kernels, and historically Sony with the PS2 having exotic "Cell" processor units.

You mean PS3? It had the CBE.

The Switch also runs on FreeBSD, not custom.