Not sure if soulbound tokens are a good idea, but I am certain it’s a terrible name.

They might not be because engineered identity, and identity permanence or requisites can have unforeseen and unintended consequences, more for some than others.

Crypto systems should be upgradable. Ethereum has been down this path already and had to quickly change course after the DAO hack

tbh I think most cases SBT can be substituted with just signed messages or more formally with Verifiable Credentials. You can have on chain code verify signature/VC easily. On the other hand, verifying SBT offline is much more difficult. Also, SBT has worse privacy