There is also a very common requirement in IAM space around Group/role mapping of the user. i.e., the IDP mentions which role/Group the user belongs to and RP maps this at it's end to provide access and set policies.
Ideally I understand that SCIM is used to generally to provision users and we have mentioned JIT is out of scope for IPSIE. But group mapping at the time of user login is real time and I feel it should be part of this spec.
Probably we should make it a standard in OIDC SL1.