That is not cynicism, it is structure. A firm with one product has one recommendation available to it, and the incentive runs in a single direction.
We hold five capabilities under one engagement: strategic recruitment, HR advisory and support, training and capability building, workforce analytics, and employee wellbeing. That breadth is what allows us to act on what the diagnosis finds. Where the assessment attributes your attrition to one reporting line rather than to your hiring, we can address the reporting line. Where the gap closes faster through capability than through appointment, we can scope that instead.
In practice it means we will sometimes recommend something smaller than you asked for, sometimes suggest you correct something before you hire at all, and where the work falls outside what we do well, say so and refer you on. None of that is generosity. An appointment that fails in month seven costs you considerably more than it earned us, and it costs us the relationship as well.
There is a second effect that becomes visible only over time. The party that made the appointment also holds the exit interviews, the attrition data and the time to productivity figures, so each subsequent mandate is briefed on evidence rather than assumption. Divide those functions across three suppliers and the reasoning is lost at every handover, and when retention fails each of them can point at the other two.