People have been saying this forever.
As long as I can remember. Back in the 1980s, when I started my investing, I was told to stay out of the stock market. Fool's game. House of cards. That I'd literally be better off stuffing my savings under a mattress.
40 years and over a million dollars later, I keep hearing the same advice.
I know, I know. I'll get my "comeuppance" once of these days.