The biggest disappointment in my 30 years of adulting has been how much absolute, shameless incompetence is out there in the workforce. When I was a kid, I naively thought that adults were smart and knew what they are doing. Then I got into industry and saw so many people just outright bluffing for 8 hours a day before going home, day in and day out.
It's amazing that society even functions at all.
At least when you realize it, you are cured from any imposter syndrome you might have.
I think that's actually an interesting feature of society as a macro system. It is very fault tolerant, which is frustrating for any power user but without which the system as a whole would not function at all.