I cannot agree with that. With all for helicopters I flew in the 60s I had to control the RPM at around max by using a twist grip throttle in the end of the collective. As the years have gone by pilots have been assisted in this difficult task (initially) by suitable mechanical links that adjusted the throttle (roughly) as the collective was moved and latterly by FBW systems which of course free the pilot of the task. How many of the older types are still in operation I do not know, but I am sure there are some.
You are of course correct. I was addressing the H-60 / S-70 family specifically. I even mentioned the twist grip throttle control in my earlier post (#146)