McKinsey a top firm? The report seems to focus on consultancies which are notorious for leeching huge amounts of money from non-specialist organisations by selling "expertise" to low-calibre execs in their clients in what is essentially an entrenched political merry-go-round.

The premise here might have some insights, but is hardly paradoxical (missing from the title posted here); you'd expect low-quality firms to have low-quality practices.