Reality is that simply very few people use this functionality.
If those two open access sources become big enough, it is quite clear that someone will make a project to reconcile the data between them.
If any of those projects skyrockets the same way wikipedia skyrocketed, then the topic will be solved.
If If If. This isn't blind pessimism. This is from someone that has dealt with metadata from studios/labels for just under two decades. IMDB was meant to do this for movies/tv, but yet it's an absolute dumpster fire.
So from an outside perspective, it's fun to dream a little dream, but from a gray beard it's just yet another dream.
So, we really have not made any forward progress here