Safe should be outside of Teams and available to other Microsoft software
The Safe makes more since to be a separate service that is accessible to other Microsoft software like Edge, Teams, Windows 10, Xbox, etc. That way the info therein can be shared or used securely through a wider range of products.
You always have Onedrive safe. I don't mind it being separated (mor secure), but maybe make it easier to share or copy content from one to another.