My bias is towards there being a lack of connection between ones marketability and their skill based on my biased and limited observing of people performing rol

My bias is towards there being a lack of connection between ones marketability and their skill based on my biased and limited observing of people performing roles they are believed (by people who put them there) to be better at than it is revealed that they are. I have also observed people keeping these roles through the relationships they manage with the people they are accountable to. Relationships in these circumstances are about marketing one individual to another. I'd be surprised if these observations are limited to my own experience. Somewhere in amongst all the biases of our individual experiences we must determine something to be fact. For if I read and agree with a scientific paper which outlines something I regard as fact, it is still subject to my experience and hence we must ground ourselves on the basis of our collective experiences aligning.