It's a bit different since the industrial revolution, and specifically in the 20th century. There were periods of time where technology remained relatively sta

It's a bit different since the industrial revolution, and specifically in the 20th century. There were periods of time where technology remained relatively static for hundreds of years and all that was required as practice and the generational transfer of knowledge. Now we can go through several revolutions in a single individuals generation with the relics of several generations past still in implementation and no one really sure of how they work/how to make them work.