Aside from high end joysticks I don't think there's any controllers which make use of 2 stage triggers regularly.btw any reason triggers like those haven't caught on?
I feel that triggers were stuck onto controllers so that people could play driving games without needing a wheel. Everything after that was probably an afterthought. I mean they don't make good buttons, are often uncomfortable and there's no standard for their design or tech.
There's just been no reason to make significant improvements.