@Amara
"It will be used to implement the Chinese-style social credit score system."
The chinese social credit score is NOT a self-sovereign identity. The whole point of any SCS is that the government decides what your score is. With SSID, this is impossible.
For example, if you decide to put a contract into a public blockchain and sign it with your SSID, which only you can do, the contracting party could decide to rate you based on wether you fulfilled the contract or not. But that would be stored with their ID, not yours, as they don't own your ID.
In contrast, with governmental digital ID, the government owns your ID and will rate you, no matter wether you made a contract or not. In fact, they will rate you for not consenting.
@Pat
"Yes, one internet outage and suddenly everybody isn't using digital IDs anyway."
A PowerCube or similar technology can run a server rack without being plugged into the power grid.