I don't listen to my saw dealer. I listen to my saw. They fix and sell stuff. I take trees down. My last stihl dealer used to beat me up over pulling the screens out of my 200t's. He would carry on that my saw was over revving. Id tell him "perfect".
To me, many saw dealers are just repeating what the company has fed them. I think they'd be better off listening to the tree rats, not the local sales rep.