Sorbothane is an excellent damping plastic material (another type of plastic polymer). I would agree that a heavy turntable with constrained layer damping or with sorbothane plastic footers will be an improvement on just a heavy turntable alone.
Note I never said that damping is not good with turntables. I only said that high mass turntables perform better than low mass turntables in my experience. I suspect that very light weight plastic-based material turntables are just cheap products that are inexpensive to make and low cost to ship. A heavy weight turntable requires commensurate shipping materials and even a crate.
I maintain that light weight turntables are of greatest benefit to the manufacturer and retailer rather than the end user - cheap to make and a light weight plater can run on a cheaper smaller motor, cheaper to package and ship too.
Note I never said that damping is not good with turntables. I only said that high mass turntables perform better than low mass turntables in my experience. I suspect that very light weight plastic-based material turntables are just cheap products that are inexpensive to make and low cost to ship. A heavy weight turntable requires commensurate shipping materials and even a crate.
I maintain that light weight turntables are of greatest benefit to the manufacturer and retailer rather than the end user - cheap to make and a light weight plater can run on a cheaper smaller motor, cheaper to package and ship too.