Most people have at least a vague idea of how a combustion engine works, don't they?

Kids ride buses; I'm pretty sure they don't understand the marvels of engineering they're benefiting from.

My point is: it should be possible to use something without fully understanding the minutiae of how it works. We call this “user interface design”.

You should be allowed to live in a house without a full understanding of the architectural details that prevent it from falling down.

I'm sure no single person understands every detail of the diesel engine, arguably nobody so far can solve the Navier-Strokes equation exactly. But even children understand that the car needs fuel and they might now that it has an engine that can break if given the wrong fuel. They could, at least. The fact that there are those who don't only corroborated the fact that there are folks who don't know how ... what was the actual problem? Will be owned by having their traffic captured.

probably this

https://en.m.wikipedia.org/wiki/Navier%E2%80%93Stokes_equati...