Afraid you may have been part of the problem, I found the opposite true, they were very easy. All of them. None of my IRL friends had issues either. I met people online who had issues all the time, but if they wanted to do it they would just push on and I would help them as much as possible.
I always remember getting a group to do a full DPS (amber?) drake run in Oculus (pre nerf ofc) and commanding them with a set macros telling them when to release and when to stack lol and when to run away and begin again, basically playing their characters too. Give them instructions and they can do it, help them out and they can do it. That Oculus run proved it to me.
Some people may be beyond saving, but most - and a large majority, are well within the threshold of learning and getting better and succeeding. Alongside that, the fact that I was able to keep myself and the other party members in sync shows that there is a great room above me to challenge the playerbase even further.
Heroics staying as they are is great, the masses can be taught - and they will appreciate it, and enjoy the satisfaction as much as we do.