This is true, but perhaps a bit of a tangent to a parable. I was merely reacting to the statement that most construction engineeers wouldn't know "how concrete

This is true, but perhaps a bit of a tangent to a parable. I was merely reacting to the statement that most construction engineeers wouldn't know "how concrete is made". Most of them could tell you a thing or two about it, it's even in the curriculum. They are even expected to know about different preparations. The idea that specialization doesn't exist is a bit of a straw man argument and not something anyone seems to argue.