Since everything has to begin some where. Now lets think about precision flat surface plates, machine ways, micrometer screw threads. They didn't just apear from nowhere. So how many people could take a poured slab of iron and turn it into a precision plate, without using any kind of machine to cut it? So next time you hold a nice machined precison part, do you know how it all began?
And if they didn't exist niether would these computers we all use. Or anything else mechanical everyone takes for granted.