The usefulness of a feature depends also on its possibility of being exploited into software (maybe hardware). What good that MKV supports internal subtitles (which is a rather common feature) when no BD-player known to me can use them and needs external files?
The more "hidden" a feature is, the lower the probability that a software/hardware (other than the one that created it) could cope with it.
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Born in the USB (not USA)
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