Why the hate for HR cams.

Because everybody's hydraulic lifter right now is at the very least questionable. At the worst, a POS. Much less to go wrong with solid lifters and they make more power. Lastly, with a good quality rocker arm and shafts the "constant valve adjustment" thing is a total lie. With high quality parts, even an all out race engine MIGHT need a valve adjustment once a year. Then again, it might not. There's simply no down side.