Just because you do know any or that there are no know to the public does not mean it is secure. Do we know if the plex communication with your server is secure? No one cares, because no one is looking into it.
The main issue, is that ita not that simple to get new versions on the closed eco systems on many smart TV, especially when you are just a single dev and no company who can throw money on the problem.
As I said, the issue is not that big, and mainly an excuse for most ppl. The API break will come, hopefully sooner than later, but it needs to be carefully designed, to prevent issues in the future.
But again, the current issue is not that much of a problem. I do not see the benefit of anyone to probe my server if i have certain media files on there. And i do not use the default paths.