It's much easier to maintain, as headsets have become integrated it's become harder and harder to work with anything that runs from the brake levers through the frame.
The casuals whose bikes haven't seen a wrench since they were assembled aren't buying wireless groupsets. For them: we're in agreement about belts and internally geared hubs.
Automatic shifting has yet to prove itself to be more than a curiosity. A 20-something year old Autobike came into the shop I was wrenching in. It still worked shockingly well for being covered in rust. In good shape it would be an entirely adequate solution, if only it solved a problem anyone had.
My money is on e-bikes entirely supplanting any demand there may have ever been for automatic shifting on a bicycle. The motors have enough oomph that they make a lot of shifts unnecessary if you're not looking to maximize speed/battery life/whatever.
I cannot understate how big of a problem shifting is for the demographics you are not seeing on bicycles.
This was literally the only one I've ever seen. And I volunteered for a year and a half at a community bike shop that was infamous for attracting oddities and evolutionary dead-ends. For instance: a side-by-side bicycle built for two. If there were a gazillion Autobikes out there, we'd have seen a couple. People simply didn't buy them.