A question: What are the situations where you think it will benefit people more to go the open route than applying directly?
One way of thinking about it is
advantages of "Apply HN": getting significant calibration and feedback on an idea that improves it whether or not it is selected, a chance for a partial team to begin discussions with other potential co-founders, and the (small) chance of having an idea selected because of overwhelming support when it wouldn't have been chosen through the normal process
disadvantage: exposing the idea in a very early state to thousands of smart motivated people who are then have the time to come up with better variations on it
Obviously the tradeoffs are different for different teams and ideas ... and there certainly might be some advantages and disadvantages I missed. In any case, I'm curious about who you think might benefit most from this.