That it is not true . Such feature is not in contrast with privacy . You can build a system with this ID and all the transactions are encrypted impossible to read without the ID .
This ID CAN identify uniquely a person and it is different from MUST identify
The are so many benefits with this ID evrytime I think to solve a problem in cryptocurrency I found that can be solved by this ID.
For example the intrinsic power of POW can be replaced by a system with these ID, or the problems of a lighting network can be solved if there are these ID . It solve a lot of problems of POS .
It is also possible to develop a cryptocoin where 1 Human = 1 coin .
It become possible to develop a coin where the system give coin to IDs not strictly to miners .
In general you can take almost all the advantages of a "centralized" management and all the advantages of a decentralized management
There is no way to create this because you need some way to ensure one person doesn't create a billion different IDs, and for that you need a central authority.
Your best hope is create a puzzle that only a human can solve, but is easily verifiable by a machine - once you have this, you can replace PoW with it.