Are there any mono tracks that have currently never been released on DVD/Blu-ray?
Some of the Dirty Harry films.
The original stereo mixes for Back to the Future haven’t made their way to DVD/BD either.
The mono mix for Star Wars has NEVER been released on video officially!
Are there any mono tracks that have currently never been released on DVD/Blu-ray?
Yes. A lot actually.
It seems like it’s more rare for the original mono to be included then not.Sorry, I forgot to say original mono tracks. While it’s true the original tracks for the films mentioned above have never been digitally released, the 5.1 mixes still sound the same as their originals with no noticeable changes made to it.
Actually NO they don’t.
Dirty Harry
https://m.youtube.com/watch?v=Evr1sI1UScw
Back to the Future
https://m.youtube.com/watch?v=LFo1vaDk-SA
Everything you said about Star Wars is correct however.