Take over ownership of ex-users Dashboards

we have an interm and need to make sure that ownership of all content created by this person has been transferred

the suggested solution here to take ownership can be performed until the person is still there, but what if we overlook an item?

the solution iin 1st post is not disclosed but looks to have some flaws.

is there no way for an admin to change ownership of created items like boards or dashboards?