I've never seen a SAML IdP that can't release that stuff as claims when configured properly. Are you having trouble getting people to do that when you use SAML?
Oh sure, a SAML IdP or OIDC OP _can_ release all kinds of info, but they generally don't if our experience with InCommon and eduGAIN IdPs is any guide. We even made sure we complied with REFEDS R&S (https://refeds.org/category/research-and-scholarship/).
