Plastic lenses in certain uses can produce decent results. If plastic lenses were anywhere near the quality of glass lenses, the lens manufacturers would have switched over years ago.
This could not be the all panorama. Every year lens designers produces new products and ordering too many molds and send to the garbage can is a enourmous Money. I watched canon factory tour and their grinding polishing machines are full automatic and extremelly fast. But may be polishing heads are costing too much Money, I dont know. And optical polymer is very expensive while BK7 is peanuts.

In my dreams , I am seeing a 22mm LOMO Square Front Anamorphic Cine lens cut from the acrylic. Its a small television size lens and 25000 dollars used.