Similar to that of video games with their adjustments, but since production normally begins by separating those said parts into tracks and then added during post-production. So, in a way, it's probably deemed possible. I would go for it, and maybe lower music and sound effects to raise dialogue, etc. Not saying that the options make it either "On/Off", but maybe a 1-10 slider.
Any thoughts or speculation on this possibility someday?

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