This essay The psychology of learning by Robert Strandh is worth reflecting on. He draws attention to people being too 'performance oriented' - sticking to what they know will give them immediate results, at the expense of discovering better ways of working. I'm generally more 'perfection oriented'. I'm interested in learning for its own sake, particularly when it comes to computers. However, I have been guilty of dismissing ideas, tools and languages I haven't spent enough time to understand. Maybe I'll give them another look, or at least acknowledge my ignorance.
Of course, and this is something he doesn't mention, you can be too perfection oriented. The trick is knowing the difference between the two attitudes and choosing the right one at the right time.
Rigidly defined areas of doubt and uncertainty.