This is how venture work, returns are long-tailed
> despite the fact VCs outperform the market on average, the returns are driven by the top half of the predicted quality distribution. By dropping the bottom half of investments and instead investing in the market, returns would have increased by 7 to 41 percentage points
https://www.nominalnews.com/p/new-research-highlights-decemb...
Apparently this is why Sequoia is backing Musk with x.ai.
The dataset was not constructed at the point in time of investment, and the missing data is signal because nobody cares to get financial info of smaller failed startups.
It's entirely possible VCs are not perfect, but this paper is certainly not the last word on the topic.