This is a starting point for a discussion that began as oral history in the council of prague.
There are a lot of places where reputation systems are valuable - but on the blockchain they live forever. That’s problematic in reality:
- One reason for reputation systems is to avoid permitting bad actors to continue acting badly. Allowing people to create new identities at will completely defeats this use case. Less seriously, in many numeric systems anyone who has an average below e.g. 4 stars just creates a new identity and starts again, so values below 4 are only theoretically meaningful.
- Many real social systems provide for some form of forgiveness, potentially predicated on elapsed time or specific actions or circumstances.
- In some jurisdictions, there are now legal requirements that you do not drag up various bits of people’s alleged past. Failing to solve the problem excludes a whole class of people from participation in a reputation system on fairly dubious grounds.
There is an inverse case, where someone recommended somebody because their interaction was wonderful, but it later turns out that the recommended person did something terrible in the same situation to someone else, and so the recommender wants their recommendation to be “forgiven” - i.e. no longer taken into account.
(as far as I can tell, this topic is related to some rings but is really at the level of primordial soup. Feel free to suggest it should be marked otherwise).