Technically they did abandon the hill after the US Army got called in though and it left a deep distrust of gubbament in every mountaineers heart that persists to this day because they targeted the miners instead of the coal bosses who at that point were ordering hits on local LEO and paying off Baldwin Felts to wage war on the miners. They didn't necessarily pussy out at that, they walked off because a lot of them had family or service records themselves and their fight was with the mining companies and private goons they hired to kill miners, not with army vets fresh from WW1. But it was a major mindfuck for them to find out that when their bosses were paying private mercenary squads to roll through their camps executing people in tents, the Army got called on the miners instead of the people doing the massacres.
Your point is still right though, workers who actually produce results tend to have more bargaining power and that's increased even more when you specialize in something a lot of people either can't do or don't spend time on.