I guess you comment as an exec but this comment does not help make the case. Without being an engineer myself, I would be very frustrated with the last paragrap

I guess you comment as an exec but this comment does not help make the case. Without being an engineer myself, I would be very frustrated with the last paragraph. It uses a statistically true fact to make a meaningless argument (how is optimising for top 50% different to e.g. optimising for bottom 50%?). Furthermore it demonstrates a view of a team of engineers as a bag of individual contributors. In a team, skill and talent are only one factor in optimising team dynamics. You don’t trust in numbers, you trust in dynamics and collaboration and in people growing within your organisation. I recently hired a PhD and a bored junior admin whose most exciting piece of work was scripting his boring work away at the same day. Also to your core intended argument, you hire an engineer in a couple of interviews, an exec would go through an extensive round of meetings and interviews and therefore you would optimise the process across different dimensions. The margin of error should be pretty similar, given fundamentally organisations have an underlying risk appetite even if it is implicit. The issue is that execs have more experience manipulating your perception of risk and therefore you should go with your eyes open, because this is part of the skillset you are probably looking for anyway.