Great question; the latter, because as you mention, YC was a product of a moment in time and that moment has passed, but during that time horizon, they were very successful (imho).
Edit: YC says "Build something people want." and so I'm going to riff off of that in a bit of a meta way: "Support experiments worth conducting." The accelerator bit comes in once you've reached product market fit and need fuel for the rocket ship, but until then, you're just running an economic science experiment.
Edit: YC says "Build something people want." and so I'm going to riff off of that in a bit of a meta way: "Support experiments worth conducting." The accelerator bit comes in once you've reached product market fit and need fuel for the rocket ship, but until then, you're just running an economic science experiment.