Cascading collection name changes?

I have collections. A LOT of them. We’re talking close to thousand, if not several thousands actually.

I’d like to change the name of a parent collection, but that does not cascade down to child collections.

For example:

PARENTCOLLECTION1/CHILDCOLLECTION1

Let’s say I change the name of PARENTCOLLECTION1 to be PARENTCOLLECTIONNEW, then CHILDCOLLECTION1 will now be located in

PARENTCOLLECTION1/CHILDCOLLECTION1 (deleted)

I mean, it is evident to me that parent collection renames and the subsequent change in path location should cascade to child collections. What is the reasoning behind this and is there a way to rename my parent collections without spending another several hours manually changing the rest?

Is there a CLI order to automate renaming?