If you rode a 250 smoker it would be a different story. they can be screamers like your bike, or you can tune them to be mellow like a 4t. 125s are always screamers cause they have to be tuned to keep up with 250fs. technically they could be mellow but than they'd be too weak to keep up with 250fs... but some people detune(or really just change the powerband/widen it) for woods riding.
dude, you have no idea. Smokers rule the woods, why do you think some of the biggest part of KTM's sales are woods smokers?
Ahh you bring out another myth. Guess what? factory riders will ride what the bike maker gives them, and obviously, especially for the big 4, that's a 4poke.
Works is more motocross style, the "f's" do better with their superb traction, don't see many riders on 2t's there, factory or not.