Management as I see it has to do with managing the resources of a company
just in the right way. That means there are many wrong ways and few right ways. So instead of providing to few resources for a task you could of course also mismanage into the other direction and have a ton of people doing nothing.
That is not the point.
Typical organizations very often have both at the same time, but in different places. (Bad) managment sometimes has a hard time telling the two apart, but in my experience they are more afraid of allocating too many resources ("wasting resources") than of allocating too little, because the cost of allocating too much is obvious to their superiors, while the costs of allocating too little is much more hidden, delayed and harder to correlate.
If that really good employee quits after three years of resource-starvation, the causal connection to mismanagment might not be drawn, the manager might even be applauded how well they managed the resources. The friction that comes with replacing that person, however, is real.
There are organizations that burn through employees like it is nothing, and they think that amount of turnover and the waste of resources and time that it brings is normal.
I argued against that.