I am confused as to what you mean by people who have performed post-doctoral work. If by that term you mean anyone and everyone who is recruited to perform research after obtaining a PhD in a given field, such as those who jump right in to the path of a tenure-track position or those hired by industry or national labs to do research, OK. If instead you mean those who could not find suitable employment in their field and labor away in what is commonly advertised as post-doctoral positions at close to minimum wage, well they have my pity, but they are not the sole keeper of the flame.
Just puzzled as to the terminology.
Read not to contradict and confute, not to believe and take for granted, not to find talk and discourse, but to weigh and consider. - Francis Bacon