If I am getting the drift right here, the root of the problem is that the Product Org is not prioritising well, and putting an upper limit on the total story points pushed in a release ?

That would lead to a large number of stories being classified as "Priority" and left to engineering to figure out how to deliver.

Separate Product Orgs, like or hate it, are not going away anytime soon. If anything, I believe they will become more ubiquitous.

Probably what we need is not more and better ticketing system, but better prioritisation systems, with well defined upper limits on how many story points can be released at once.