The excuse that it's for "Legal Reasons" is BS. That whole argument went out in the 70's. Since the user can use sound-amplifying headphones & speakers, it's not up to the PC manufacturer to step in and "warn" the user. Besides, about half of the time the "headphone" port is used, it's used for speakers, not for headphones. Anyway, don't headsets come with warnings? Has ANYONE heard of any lawsuits against MS for hearing loss? I sure couldn't find any.
What this is, is someone's poorly thought-out "feature" idea, which was approved by some manager somewhere without any field testing. And now we're stuck with it, because managers hate to admit they're wrong about anything, much less admit they added a feature without checking with the users. I've seen this sort of thing SO MANY TIMES in the tech industry that it makes me sick.
The good news is that eventually enough people will gripe about it that they either remove it or give us the option to turn it off. On things like this which don't impair functionality for most users, it'll most likely take a year or so - by which time someone will have developed a utility work-around or fix anyway. It appears to be part of Win8.1 (at least I never saw it before then), so I'm guessing 3-4 months from now, start looking for a fix.
In the meantime, we all have yet another opportunity to build up more anger against MS for yet another poor design decision. It ain't the first, won't be the last. After 20 years or so, ya just kinda get used to it! :-)
KEEP THE FAITH BRUDDAHS!