Yes. it is dissapointing to ses so few large digital sensors on the market. Its all focusing on mobile phone sensors right now...
I for one would love for Apple or Samsung or whoever to release a photographer’s smartphone with a micro 4/3 mount (it’s the only multi firm properly documented lens mount system and also seems to be the sweet spot for trading off image quality, sensor readout speed, and size) BUT the phone would be at minimum 20mm thick.
There are plenty of camera companies, mostly using Sony sensors or Sony fabs.
The lack of manufacturing diversity isn’t a shortage. It’s a different problem. Is there a shortage of cpus?