The DSLR camera market has several tilt and shift lenses available to it. Nikon make three models, Canon make two, and even the Rokinon/Samyang factories make plastic copies of these that are quite decent.
We mirrorless shooters miss out – only a slightly dodgy aftermarket adapter that still needs a Nikon or Canon lens up the front of it to work.
It’s not rocket science, guys. it’s just precise little gears and castings, and we’ll be delighted to pay for them. We don’t need or expect auto focus or exposure and we know that you can incorporate lens corrections in the firmware as you do that already.
Give us an Olympus or Fujifilm 20mm tilt/shift and prepare to take our money away in pickup trucks.