> It generally takes a lot of motivation to convince your superior (and finance team) to pay the millions McKinsey would charge per week.

And an insurmountable barrier to then declare it was a waste of money.

ie once these initiatives start - they are inevitably declared successes because too much has been invested ( literally ).

So the consultants always leave with success declared, whether it works out in the long run I suspect the consultants will hardly ever know - just moving on from one declared success to another.