Does interpreting the descriptions '1-dimensional engineers' or 'it's common in tech' to imply 'an entire job family' suggest low or high reading comprehension?

Does interpreting the descriptions '1-dimensional engineers' or 'it's common in tech' to imply 'an entire job family' suggest low or high reading comprehension? This thread is littered with examples lack of understanding of PM's (and other) roles, to the point wherein it's almost bigotry. It's understandable that many people don't know what 'marketing' or 'finance' is, but to project their ignorance, and couple it with with moralizing suggests exactly the kind of insufferable arrogance I'm pointing out. From this thread: "The value creators (engineering/programming/creative/design/product) people have been pushed aside for the value extractors (finance/managers/marketing/oversight) and now the extractors are creating the product. It is a completely backwards setup that is causing products to suffer." (This one is wrong well past the point of being offensive) "After certain critical mass of PMs were achieved, things went only downhill. I" " I really haven't seen a tech company with a PM role which provided real value." I started out as an Engineer and often felt this way as well, but having now played a variety of roles, I'm basically embarrassed at my own organizational illiteracy. It's common in tech and it's embarrassing for the 'job family'.