> To counter your point, it's not just that product managers are easy to blame; it's that it's literally their job to change stuff.

Sure, but companies aren't being blindsided by project managers who sneak into their org charts and start driving change unbeknownst to company leadership. They're hired to do these things and their performance is based on how well they do them, just like anyone else.

This might be a good example of the struggle of middle management: You get blamed from all sides for just trying to do the job you're assigned.