I see this in the form of the expert beginner. When you stop learning or think you know it all, you fall into the expert beginner phase. Until one realizes there's so much they don't know, they'll be stuck there.
Another way to phrase this is when people think they can no longer learn from others. They tend to think they're the expert and should be the one teaching all the time. A good example is people giving unsolicited advice (see the great discussion in this post).
Our industry can be tough. We're expected to know so much. In a way, we might even be trained to act like an expert even when we're not. However, admitting you don't know something is a huge step toward growth. Change is hard. If you're not accustomed to saying, "I don't know," it can be tough to change that.
The best medicine I've found for this is to keep an open mind and always look for ways to improve. Be confident in your abilities but know when to pull back and admit your shortcomings. A good team won't fault you for that.
Great to see someone post some Erik Dietrich/Daedtech links in here, he's an excellent writer
This goes hand in hand with the Dunning-Kruger effect which was brilliantly put by Socrate where he basically said: "You're more knowledgeable when you know what you don't know".
Additionally to that, in those days, the notion/concept of admitting one's ignorance (ie. saying "I don't know") is more often than not a source negative criticism and what not.
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