I completely disagree. It's really not hard to find a company with great product market fit, say series B, get a bunch of equity, a decent salary, and wait a couple years for your equity to be valuable. Assuming the company is successful (of course there's risk there, but by series B a
lot has been mitigated), your equity will likely be quite valuable. I actually think, risk adjusted, that's the easiest way to make a bunch of money.
I joined a startup long after product market fit, it was pretty obviously going to be moderately successful, and I was employee ~100. I never worked too terribly hard, and my equity was worth about 50% of my (not too low) salary each year.
If you're not joining at or before series A, a lot of the risk has been mitigated, and there are markets opening up to sell your equity into.