I know some car mechanics that can take apart an engine in their sleep, and definitely have a knack for mechanics that many mechanical engineers would envy, even with their lack of mathematical training.
I see the same in the IT department of my company. Some years ago the local techs could make a lot of changes but slowly corporate IT has taken away power from them and every little thing has to go through architects who then do exactly what the techs would have done anyway. Ford also had to pay more money because the assembly line jobs were so mindnumbingly boring that nobody wanted to do them.
I don’t think the turn of the 20th century was more egalitarian in the sense that you speak of.
Back then they had classes of people who thought innovation was theirs solely and we have that now too.