In some games, average is not enough to get you any points. In Investing, you can even win with average if you live long enough. But performance without a large population size of who is trying and what they are achieving in the aggregate is meaningless. And I don't think in investing this statistic is so easy to gather like census statistics.
At the end of the day, what really matters is the performance in everybody's personal portfolio anyway!
If anybody here wants to check every post manually to see whether a post was long or short, feel free to add it to the data, which I made accessible to the public!