The reason for that is because we hit a point where it was cheaper to buy an off the shelf microcomputer that came with wireless capabilities than it was to design a purpose built control board.
Once you’re building a device that has the hardware for itg, you may as well try to use it as a competitive differentiator.
When this wasn’t a total failure, manufacturers started spending a bit more effort to develop the control part of things, which is why now we have a lot of different unified hub type apps.