Comment by Ninn

> To me it is reasonable that orgs may want to eventually reuse an email address on a different user account. That's a feature decision made by the IdP so SPs need to respect it

I think everyone, including the authors hopefully agrees with that logic and sentiment. And that would be the literal point of the sub claim after all!

But the implication in the article is still, as i read it, that it changes in place in practice, and not in the case of re-creating the user under the same workspace. But i obviously do not have the background to clarify!