[GrumpyYoungMan]

>Had it been for a trucker position you'd be asking for "driving license, laws and regulations, engine design and car physics".

There nothing wrong with a trucker just knowing "driving license, laws and regulations", ... as long as they don't mind being laid off when there's no longer a need for that skill.

You're essentially arguing that it's okay to be a one-trick pony. It's not.

1) IT and the software industry change too fast for that to be anything other than career suicide. What do you do when your tricks become out of date?

2) You're competing with all the other one-trick ponies out there. There are a whole lot of them and that makes one-trick ponies an easily replaceable commodity. Yes, yes, everyone's replaceable in theory but its best to minimize that as much as possible.