While I don't think crypto is the wisest place to vest oneself, I think you could flippantly say this about a lot of financial instruments over the years.
I think that is sound advice. I think it's very unlikely however that all people will happen upon that advice and agree that it is sound. Especially unlikely with an entire industry of financial sales people who have a vested interest in selling all kind of financial products.
But if it's your life savings, put it in an index fund and forget about it for a few decades.