@Rockky 

 Benefits:

• It prevents from accidental deletion of jobs, client, backupset, subclient, etc data bearing entities when they have valid jobs.
• The expiration date for the read-only is set to match the data retention time established in the storage policy copies. These archive files cannot be modified or deleted by any user or application until the specified retention date.
• Once the retention expires, the system deletes the archives as part of Data Aging

Drawback:

• WORM Copy cannot be cleared.
• The data retention on the WORM Copy can be increased but cannot be lowered.

https://documentation.commvault.com/2023e/expert/157483_locking_retention_and_deletions_with_worm_storage_lock.html

You should be able to enable WORM on tape copies. Just checked this in my lab