> Being extremely good at something increases the gap between said something and everything else.

You're also potentially over-specializing at one level while at the same time neglecting other levels.

Musicians run into this problem when, for example, they rely solely on muscle memory to make it through a performance. Throw enough stress and complicated music at them and they quickly buckle.

Meanwhile, a more seasoned performer remembers the exact fingers they used when drilling the measure after their mistake, what pitch is in the bass, what chord they are playing, what inversion that chord is in, the context of that chord in the greater harmonic progression, what section of the piece that harmonic progression is in, and so forth.

A friend of mine was able to improvise a different chord progression after a small mistake. He could do this because he knew where he was in the piece/section/chord progression and where he needed to go in the next measure.

In short, I'm fairly certain OP is talking about these levels of comprehension in computer programming. It's fine if someone is immensely comfortable in one IDE and grumpy in another. But it's not so fine if changing a shortcut reveals that they don't understand what a header file is.