I don't think it's important at all. PG has a saying that good founders become more formidable during their time at YC. Also, demo day prep and fundraising is

I don't think it's important at all. PG has a saying that good founders become more formidable during their time at YC. Also, demo day prep and fundraising is pretty intense at YC so most founders get much better at talking about their startups after going through the program. That might explain the signal you are seeing.