Or you could mitigate the next dot-com style crash (which wiped out nearly 80% of the NASDAQ composite).

Back then, it was "day trading" that was one of the warning signs that a bubble was ensuing. There are certainly shades of the day-trading phenomenon in the "r/wallstreetbets" gambling, and wildly overvalued meme stocks like Tesla. And this mad rush to relax the guardrails for what appears to be wildly overvalued IPOs.

Bubbles, and their inevitable collapse, are generally not as big of a problem for younger passive investors, but they can be for older ones. (Hence why I've got a "bond tent", value tilt, and other diversification. I'm at the stage where "underperforming the market" is less of a concern than "mitigation". :) )