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PCs have all of Microsoft's APIs and frameworks at their disposal and Nvidia/AMD/Intel doing the heavy lifting in compatibility and optimization with their drivers.
I suppose it might work for PlayStation if the CPU and memory are just about the same across platforms, closer even than the Xbox Series, but then just the GPU size alone (and PSU + cooling) might not create that sort of price gap between SKUs.
Plus development costs for the manufacturer make it even harder for such an idea to leave concept stage as you mentioned.