Then crypto will never be the future of money. That's their point.
But honestly, most HN uses password managers -- if crypto became primary currency, that would make hacking someplace like Bitwarden or Coinbase enormous world shattering honeypots -- like Nation state targets.
This and also arguably 70 year old moms are probably just fine at "don't lose this crucial piece of paper" given stuff like social security cards, birth certificates, savings bonds, and all the other bits that have been important pieces of paper for most of their lives.
But honestly, most HN uses password managers -- if crypto became primary currency, that would make hacking someplace like Bitwarden or Coinbase enormous world shattering honeypots -- like Nation state targets.