There are some good arguments there, but if you bought Bitcoin at $500 and it is now $2000 plus then it is doing better than anything else out there. If you are going to go out and put everything into it, that is nuts. But a moderate amount in crypto (several interesting ones out there) as well as hedging in other investments seems sensible to me. My thinking is always be willing to lose something. I wouldn't use Bitcoin as a pension plan and even they go bust as do most currencies. I am cynical so I expect everything to turn to poo really.