If you compare it to power steerings - its like EPS - manufacturers love it because it does 2 things
1 - increase fuel economy
2 - very cheap to produce
3 - very cheap to install and control
People try to palm the steering wheel which overheats and shuts it down, then they have to visit a workshop again and pay money, In HPS - all that would do is slightly heat up the oil - which would be cooled down very quickly anyway.
Ever wonder why names like Allison, ZF, Aisin etc dont use CVT in trucks?