Why?
How good is the network if it doesn't even give you the basic knowledge for a thing you are extremely likely to have to go through (Series A), right after YC itself?
Handholding start-ups through their Series As isn't YC's core competence. If one could schedule two and a half meetings a day, on average, individual partner pitches could be had in 3 weeks. Give it 1 week for a partnership meeting and 1 week for a term sheet and you're talking zero to term sheet inside a month and a half. That's good. Unusually good.
YC's network serves to speed up the rate at which those 30 meetings get scheduled. Not change the fundamental dynamics of company-investor fit.
In any case, we have no baseline. It may be the case that 3% of YC coffee dates result in a term sheet while 0.3% of non-YC meetings do the same.
> You think they would have at least heard about something to this effect from their relationships with YC companies?
There is a lot of information buried in relationships that never surfaces because nobody is incentivized to ask. No CEO worth her salt will start waxing lyrical about all their failed coffee meetings when a term sheet on the table needs to be closed. And after the capital is raised, there are more pertinent questions for both sides.
Also, the entire tier of coffee meetings don't really happen in Asia, we tend to do either meals or in-house presentations in my experience.