I would assume it's the chicken-and-egg problem. Why add a ~$100 component to a machine that might never be used? It's similar to how servers never had GPUs because that was a thing only consumers that play videogames need, right up until the point that a mixed combo of A) system on a chip manufacturers needed to always include a GPU for design simplicity, and B) GPUs were realized to be rather efficient generic math co-processors for a wider variety of problem domains than just "graphics" (because who needs graphics on a headless server?).
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I would assume it's the chicken-and-egg problem. Why add a ~$100 component to a machine that might never be used? It's similar to how servers never had GPUs because that was a thing only consumers that play videogames need, right up until the point that a mixed combo of A) system on a chip manufacturers needed to always include a GPU for design simplicity, and B) GPUs were realized to be rather efficient generic math co-processors for a wider variety of problem domains than just "graphics" (because who needs graphics on a headless server?).