Yeah I get that, but I think there are two sides to this. One is that it is possible to guess ballpark figures without knowing the intricacies, and I think any

Yeah I get that, but I think there are two sides to this. One is that it is possible to guess ballpark figures without knowing the intricacies, and I think anyone with experience in a big tech company of this ilk can probably make a reasonable estimation (to within 50%?). The other is that it's easy on the inside of these situations to justify each individual role, and miss the fact that the system is too complex and a simplification may be able to drop significant numbers. I'm not suggesting it is too complex, I fully realise there's a different sort of scale involved when you operate a large globally available service like this, but duplication still happens, engineers still make things more complex than they should be, etc.