This attitude is why private equity is destroying US companies. The hubris and ignorance of investors routinely gets translated into a cull of workers whose jobs they don't understand, leaving behind "lean" organizations that retain only whatever bits are currently most profitable but are less functional, resilient, sustainable, and humane.
I would agree, except for the fact that I read Graeber's Bullshit Jobs and was quite convinced by his research showing that anything between 15-50% of employees across many surveys believe that their role is useless.
A system in which every resource is 100% utilized has no slack or adaptability.