Well for one, consultants are rarely brought in to working, well-functioning companies.

Also, scrum (as in the dot-org) doesn’t do a great job of teaching management how to measure the performance of their team so it’s very easy to be bad at anything for a long time and never know it if you’re also bad at management.

I find anything (including scrum) works pretty well if you send your management team out for training too, and don’t let them piss around with soft metrics.