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Small size doesn't have to mean lower quality or lower cost. Look at Leica M lenses, they are excellent, expensive and small.
There are three Zeiss Touit lenses, 12mm, 32mm and a 50mm. In addition there is the Sony/Ziess 24mm. A Zeiss 16mm for APS-C E mount would plug a hole in the 12mm, 24mm, 32mm and 50mm lineup.
There are those of us who want quality without bulk!
True, but the market for expensive, small, APS-C primes is pretty small. That's all.
I'm happy if you get the small, APS-C, high quality, expensive primes you're after. I really am. But like the Touits, which seemed like an experiment that never went anywhere... I can't see a big expansion in this direction. I hope I'm wrong, for your sake.