@chris_radcliff That's very helpful and thank you for taking the time to elaborate in detail! :)
If I read you correctly, you're also a proponent that theater mode should be something different than (or maybe rather: "a bit more of") what it is right now:
In your third screenshot the video is maximally enlarged (it's constrained by the window width already), but there is still stuff above and below it – going by what you write (less visual clutter) I'm assuming you would prefer the stuff above and below the video to be replaced with black bars and the video just be centered vertically?
Likewise in the fourth screenshot, if theater mode would also get rid of the stuff above and below the video, the video could be shown much larger and without any visual clutter, which I'm assuming would also be what you prefer?
Let me know if I got that correctly. :)