Charlie, I have to agree with you. There are many operators and schools that are still teaching things that Frank took out of the POH several years ago.
Robinson are pretty good compared to some manufacturers on their amendments, they don't come through every few weeks like some I can think of.
I have seen some schools around the world that do the amendments then continue teaching the old way. Or some instructors change and some don't. Or some chief pilots say "I don't agree with that, do it my way."
This is in contrast to the commercial organisations which will get an operations procedure change from the manufacturer, decide on a date, and from that point on everybody does it the new way.
It is very frustrating to be told that a procedure that has worked well for many years is now redundant, but that is what professionalism is all about. What concerns the thinking pilot is Why?
Often I have found in my day job that an operational procedure changes simply because a new manager has taken over and he puts his own preference on the methods. When said manager has just started shaving, it is doubly frustrating.