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.
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.
Or without which the system would function much better because all poorly functioning systems would fail, forcing designers to focus on fixing the faults
It's amazing that society even functions at all.