...to head off a lawsuit from some user. Perhaps they'll have a large banner in future proclaiming how "Sound can be loud!" to alleviate their legal duties
Already being done with personal mp3 players - the max. volume has been reduced, with some having an "override" that permits you to turn the volume up to real-world levels - at your own risk, of course.
Lots of complaints out there about this. Possibly from the very people who have already damaged their hearing...
SD