I see it as coming from 2 different perspectives. One is as you note, an antidote to imposter syndrome ("no one else knows what they are doing so I'm not alone"

I see it as coming from 2 different perspectives. One is as you note, an antidote to imposter syndrome ("no one else knows what they are doing so I'm not alone"); the other coming from the opposite perspective: the autodidact who realizes no one around them understands the underlying systems and principles as well as they do, and so is frustrated for the opposite reason.