Why isn't that person reloading? lol
Armor skill Auto Reload, means you don't have to manually reload until you change bullet type.
You're missing the point which is that good hunters will out-do the cheapness of the Kelbi bow. The Kelbi bow is again, simply cheap. Kelbi bow is highly effective in groups and notnas effective solo. Slime favors group over skill.
Solo players can be really great since you have total control and absolutely no lag.
Sometimes not even good hunters but just proper preparation. The final urgent quest boss Amatsumagatsuchi in P3rd can be defeated in under two minutes with a party of four LBG using fire rapid shot and the occasional flash bomb. The same hunter as in the dual G rank narga vid above has a video where he hunts two G rank Black Diablos by himself and completes the hunt in little over 7 minutes spending the whole hunt under the effects of Felyne Heroics which means he's at 10 health or less.