It would be more expensive to make and I doubt many people are willing to pay extra to have less functionality that's not upgrade'able and more expensive to mai

It would be more expensive to make and I doubt many people are willing to pay extra to have less functionality that's not upgrade'able and more expensive to maintain. Knobs and switches are really (relatively) expensive, not even talking about all custom parts required to put them in nicely and time required to assemble them. I was very surprised about that when I got into electronics. You can basically get a SoC cheaper than a single decent on-off switch.