It's not just that they're too big—it's that they're morally corrupt and largely unregulated. These firms have been involved in everything from tobacco lobbying to the 2008 financial crisis to pushing opioids, and that’s just scratching the surface. Despite their role in these crises, they’ve faced zero accountability and continue to rake in massive profits.
As for their supposed value (which comes directly from ex-employees): big consulting firms are essentially hired as a liability shield for the C-suite. Their main job is to back up whatever the CEO already wants to do (usually cost-cutting). This way, executives can claim: a) "McKinsey recommended it, so it must be right," and b) "If it goes wrong, it’s on McKinsey, not us."
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