Excellent post, and, for sure, only a person who is not an impostor by himself can think so deeply and share it with others.
As a matter of fact, the real impostors do never experience the feeling of not knowing enough, let alone that of admitting it publicly.
For starting to be worried about how much you miss to know, you should really do have to master a lot of knowledge in your own field(s).
Unfortunately, many times in life all that ones misses for knowing more is the chance of doing so. If a person has proven valuable skills in one field, he has no reason of not proving the same in many other fields ... but, usually, not the best ones are those who are given the chance of raising and developing as by what they deserve.
Career fights do matter a lot in one's chances to progress further, and mostly not in a positive and constructive way.
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