Is the latest email of his great newsletter, Tobias van Schneider wrote this:

“A jack of all trades and a master of none” is the famous saying. From early on in school we get trained to specialize. Being a jack of all trades is something bad, so you don’t want to be that person. You should be a master in one field, they say.
I like to flip this and say:
“A jack of all trades and a master of some”.

I couldn’t agree more, and as a film director (well, I just started) I feel that being a jack of all trades and a master of some really helps me to tell better stories. When you direct, you must let your crew members do what they do best, but if you know exactly what they’re doing, and really understand it on a technical level, you’ll be much more confident about the whole filmmaking process, and you will certanly have better problem solving skills.

“Since we cannot know all that there is to be known about anything, we ought to know a little about everything”
— Blaise Pascal