Creating users with same Email in Okta

Looks like Okta allows to create multiple users with the same email, it only made login name as a unique attribute for now.

So I am planning to use this for creating users across multiple environments(Dev, QA, etc.,) but with the same email. But before doing this I want to confirm if Okta has any plans to make the user’s email also unique in the near future. If that is the case I don’t want to use this as a way for environment segregation in my organization’s Okta tenant.

Am I going in the wrong direction?