Nope. It's because guys think they are getting OE quiet valve train with hydraulic rollers and then they ***** because they make noise.
Also, you learn very quickly that rocker arm geometry goes nuts using retro hydraulic lifters. And, if you want to make RPM and not have the valve train best itself silly it requires something totally different than the lifter manufacturers want.
In other words, they just ain't worth it. Back in the day I was big on the HR bandwagon. It looked like the best of both worlds. What it really is is just a pain in the ***. Agressive lobes and hydraulics hate each other.
