This metric is very similar to R&D investment as % of revenue, which is often used to define an engineering organization budget. R&D budget is framed via financial terms rather than headcount, but otherwise it's proportional to RpE.
So, in some ways, this metric is measuring something that's already baked into the budget. If revenue goes down, then the budget and headcount will be reduced too. The metric will remain as-is: it won't reflect engineering efficiency.
This metric is very similar to R&D investment as % of revenue, which is often used to define an engineering organization budget. R&D budget is framed via financial terms rather than headcount, but otherwise it's proportional to RpE.
So, in some ways, this metric is measuring something that's already baked into the budget. If revenue goes down, then the budget and headcount will be reduced too. The metric will remain as-is: it won't reflect engineering efficiency.