Because we haven’t yet come up with a technology that works as well as the natural input senses we already have.
It’s easy to wire up one neuron, but what you need is several hundred million firing in a familiar from early childhood learned/response pattern to visually identify an apple.
It’s hard work mastering the feedback from a sense much less actively using a hand. The incredibly complex action of bipedal walking is mindless for most people, we don’t remember how to do it, we just do it. It took hard work to master that skill. It would likely take a similar effort to learn a new sense and relate it to the world.
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