"Why would the workers insist on this?" The empirical evidence we have shows that unions consistently make these choices. There is a huge duplication of labor

"Why would the workers insist on this?" The empirical evidence we have shows that unions consistently make these choices. There is a huge duplication of labor and responsibilities in construction unions, the trades, etc. The workers are trying to get the company to pay more money to labor, sometimes that means more increasing the pay per hour, sometimes that means increasing the total number of hours worked. I am pretty strongly in favor of germany style labor unions, sectoral barganing and labor codetermination. The caselaw and regulations around unionization in the US are bad and often lead to poor outcomes for workers and management.