>>213354230
It's because the ones mixing the sound don't care. As for older films, you need a sound bad minimum or you won't hear jack on the highs or lows.
By the way, the Blu-ray for Disney's Fantasia is horrid. The sound is just tinny garbage and can't be mixed out or fixed in any way. Put on a Laserdisc rip and voila, it was perfect luxurious sound.