It's clear to me that everyone wants to feel that what they are doing is special and close to unique.

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This is not necessarily bad, but it's something that you need to be aware because it can be a misleading feeling.

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The main causes I observe for underestimating other professions are:

1) Your EGO

2) Some jobs really have a lower barrier to entry which attracts non-skilled people

3) The unknown of what other's actually do

Think of this, because it's very dangerous to believe that what you do is so special.