- Normally distributed endeavors: look at averages, ignore outliers.
- Power law distributed endeavors: ignore averages, focus only on outliers.
In tech, a few companies generate all of the returns. And it's fractal all the way down. E.g. there have recently been 900 U.S. unicorns minted in the past few years (IIRC), accounting for roughly $1T in total market cap. Yet 4 out of the 5 companies on this list are worth more than all of these new unicorns combined.
If you take the attitude "I don't have any chance of investing in one of these outliers", you'll only invest in "safe" things and go broke over time.