We didn't need management types to grade jobs. Over tens, sometimes hundreds of years, they were sorted by a supply & demand system. (including men-men and I'm sure women-women)
Some blokes were happy with a steady job in a warm factory a hundred yards from their house. Others travelled 40/50 miles to graft on a site in all weathers.
One could argue that the Labour Government started eroding those differentials when they opened the market up to cheap foreign labour. Now they're trying dehumanise the working classes further by imposing grades on them.