pg, going a little further, do you recall any advice you used to give at the early years of YC that now you realize is bad or unnecessary? (e.g.) In one of you

pg, going a little further, do you recall any advice you used to give at the early years of YC that now you realize is bad or unnecessary? (e.g.) In one of your essays you observ that on Demo Day the teams don't show any demos anymore (due to time restrains). And that didn't affect at all the outcome of the pitchs, so maybe your assumption that demos were essential on a pitch was wrong.