I would venture a guess that there is little interest in adding complexity to the humble shock absorber. A simple passive mechanical system is replaced with a complex servomechanism featuring sensors and actuators which live a hard life under a car.

What is the longevity vs a passive system? How much is it to service vs standard suspension? How much does this change the overall suspension design? How much weight does it add? I bet the answers to those questions since 2009 were not at all enticing to automotive designers or bean counters.

Personally, I would not want such a system on my car. It sounds like another expensive maintenance item you have to deal with that adds little or no value.