They exist and ARE somewhat used . Most CPU today have an integrated GPU. They can run cheap games to 4k with “decent fps”. At some point in the past AMD made some CPUs with a GPU part that had some more gaming capabilities.
Turns out it was a disaster.
People who did not care about games did not buy it.
People who cared bought GPUs that had much higher processing power. Because this is how PCs are built, you can change parts, so there is no demand for integrated stuff.
So it is not that they cant be used. There just is no point using that.
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