Why the hate for HR cams.

Maybe if you checked the valve lash more often than once a year....the whole point about checking valve lash frequently isn't because you have to it is all about catching a problem early.
I don't disagree, but that seems to be a point of contention with those that don't "like" solid cams. It's never bothered me to recheck lash, but some seem to be allergic to it.