Upvote:0
Well:
My checked bag(s) have been opened on every flight from/to USA and on some others
(emphasis mine)
Scope of the plastic wrap is to preserve your baggage from scratches and to keep things inside in case of zip/lock failures, so if it's worthy is up to every one's taste.
But, given your premises, it's clearly and objectively a total waste of money because it will never be able to fulfill its task.