It is to attach to a biometric property that would be safe

The co-founder of Ethereum, Vitalik Buterin, drew attention this week to a warning that has been gaining traction among cryptography experts: according to data from the prediction platform Metaculus, there is an estimated 20% chance that quantum computers capable of breaking the currently used cryptographic systems will become a reality by the end of 2030.
The median of these predictions points to the year 2040 as the most likely milestone for this technological shift.
The statement was made in response to a technical debate initiated by Ian Miers, a security researcher and co-founder of Zcash, regarding the reasons why certain cryptographic proof technologies — specifically STARK-type systems — are not yet widely adopted as privacy solutions in blockchains.