If you have the capacity and the will to build for yourself, you should already have the drive to push your idea forward. You don't need validation from them to make it work.
I hate getting judged by a "panel of experts" and their "opinions" destroying the wills to continue. Self-confidence and constant iterative validation are a big part of the founder's success. YC's model of "only the top 1% gets funding and support" has stopped producing unicorns. It exerts bias and provides false validation to the founders leading them into a false sense of security.
Resources are great, but I wouldn't waste time on a program like this. Especially they pick only 20.