PC Hardware makers/sellers think about saving every last penny they can, to improve and maintain their profit margins.

Cell phone makers/sellers don’t have that same requirement as much, as cell phones can be sold or be subsidized for with higher profit margins, so they can feel more relaxed with including more features.

Finally, it may just come down to cell phone OS companies Google and Apple pressuring cell phone makers to include that hardware, where there is no equivalent organizations for PC Hardware makers.

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