Which part of "I would argue" has hinted you that there's a supporting documentation? If you rewind back to the AppStore debut time and remember at how things worked then (and tens of years before that), it'd be the most plausible conjecture.
Don't know about the "I would argue" part but this part, "IAP is not meant for selling bombs. IAP is meant for selling full version of an app from within a demo" looks like a claim.
The part where you think you know Apple's intent, and the only possible way to know that is if they talked about it somewhere.
Ah, right, right. And pedantic nitpicking is a great way to support conversation.
I'm trying to figure out why you think IAP was "meant for" this and not that. And you keep dodging it, even though you made a factual statement that you should be able to back up.