I find it slightly odd that a lot of emphasis is put on WHO statistics of natural births, but WHO themselves are not certain on their stance with the third stage of labour, at this stage they conclude that it does reduce the risk of PPH, and may be beneficial. This was once of the deciding factors for me in having a managed third stage.
Same! It's not very clear. For reasons you mentioned, I too may never have a WHO-defined 'natural' birth...but I'm cool with that I think personal definitions very and that's done, my definition is definitely stricter than some peoples, but also a lot more lax than others