The capability for non-system admin users to delete ‘Teams’ has been removed, although the 'setting' to enable team deletion still remains in access level settings.
In an enterprise solution with ‘Teams’ in the thousands this is not feasible to manage with 2-3 system admins. Especially as the nature of teams is that they are sometimes temporary/project related.
We need the reintroduction of at least Group admins to be able to delete teams in order to manage this effectively.