F Class shooters are shooters that have become too old and or too fat to hold a rifle up with a sling or snowflake millennials that don't know squat about how to use iron/aperture sights!
Way to keep it classy, M14.
I'm a sling shooter. There's some good natured ribbing in our club between the sling and F-class guys, but it's all friendly. I'm not leaving the sling side of the firing line any time soon, but if I get too old or too fat or too crippled up to put on a coat and sling, then I'll shoot F-class. I'd rather shoot F-class than park my butt on the couch in front of the TV all summer.
F-class has the primary factors that affect their score in a different order than sling shooters, no doubt. You have to have a rifle and ammo combination capable of shooting x's and 10's first and foremost, then wind reading, and then shot execution. The rests and bags they use take a lot of the "traditional" fundamentals of marksmanship (sight alignment, trigger control, follow through, etc) out of the equation, but those get replaced by proper rest/bag setup, gun handling, etc.
Sling shooters focus on fundamentals of marksmanship and executing a good shot first, then wind reading, and then ammo/rifle mechanical accuracy (at least I do). Nailing the wind call shooting a Palma gun doesn't do much good if the rifle is pointed in the 7 ring. A ~1 moa capable rifle (sling target x-ring) isn't terribly difficult these days. A 1 moa hold isn't something everyone can achieve.
F-class guys could learn a thing or two from sling shooters about consistency and the traditional fundamentals of marksmanship. They could learn from a seasoned Palma shooter some tips and tricks for the sure 'nuff wind reading that's required to keep a 155 gr .308 in the middle at 1000 yards.
Sling guys could learn a thing or two about reloading and mechanical accuracy from the F-class guys. Cutting 1/2 MOA off your load at 1000 yards buys some wind reading error and helps pile up the X's. I'm not going to pretend that an F-open guru that piles 15-17 shots into a 5" circle at 1000 yards can't teach me something about wind, either. Extreme mechanical accuracy and mechanical rests/bags help, sure, but that's impressive wind calling. Acting like a lot of these guys don't know what they are doing is just foolish.
Regardless, chill out, realize that F-class guys are on the same team, and quit being a grumpy old man. You've made a similar reply on one of my posts that was just uncalled for. There's no place for it on this site.