You can and should try to do and know as much as possible as a human being.
You should do the same as a father - if only to relay that value directly to your children.
But in the workplace, it's much more effective to do one thing the best.
In the end, you'll be recognized as the expert and will become an indispensable piece of a massive puzzle.
If you only know a little about a lot, your edges won't interlock with the piece next to you.