Maybe that's true where you are, but it's the exact opposite here. ALL the pros, including myself, use bump feed heads (usually Stihl Autocut, Echo SpeedFeed, or Husqvarna T35.) The only people who don't use bump feed heads are the homeowners who can't figure out how to reload them.
I am running the T35 on my Husqvarna with Oregon Magnum Gatorline, square, .095. Takes me 60 seconds to reload 10-12 feet of line into the head, following which I can trim for several days without reloading. The head has never tangled or jammed in the 2 years I've been using it. Can't imagine reloading manually, I have to bump the head at least 10-12 times on every property (none of the properties are over 0.6 acres, but they all have a lot of trimming around things that will break your line.)
Amount of pros in FL who use manual heads is under 10%. Most of those are people who just started their business and haven't found out how much time they can save with a bump head.
The Oregon Magnum Gatorline is a great line, by the way.