The idea that YC can fund a web-app, mobile-app or completely web-based feature-as-a-service for 150K is well founded.
My point is that within the realm of "ridiculously ambitious ideas" are those that would require a shitload more seed capital to build out.
Do you think that SpaceX, which is obviously ridiculously ambitious, was seeded with simply 150K? Tesla? (obviously these are from the same ridiculously ambitious founder - but a well heeled founder with deep pockets.
I AM saying that there are certain dynamics which YC can't accommodate best.
YC is an absolutley stellar platform, but I would suggest that there should be a separate entry/avenue for projects which are not exactly suited for the traditional YC channel.
Maybe they could start out with "$150K to prove out the idea, consult with other experts in this space and connect with those who can help the idea along"
The point being that the initial 150K is not necessarily expected to going to the actual development of product as much as it is going to the furthering of the project.
EDIT:
I also wanted to point out that I failed in mentioning that the value that YC provides, with respect to exposure, network, connections, etc is immeasurable.
I am really just trying to say that for some groups/founders/cases/ideas -- You cannot look at the 150K funding and think that there will not be other struggles/issues.
I'd like a way to openly address/discuss this and find out what is best for each case.
PG: YC is the best thing to hit the valley since the transistor.