If anyone is still subscribed or runs across after a search (posted back in 2016 but still activity)
First, I applaud @silvercbx for his efforts to spread warnings to various forums regarding this very very bad issue, which too few of us are aware of until too Late!
Now, I won't mention the company or parant company as they were 100% open and honest, admitting their MISLEADING OR FALSE ADVERTISING ON PACKAGE LABELING > even vowing to look into updating the packaging in future (more important to me than anything)
I hope my situation may help some of fellow community members and consumers, AS WELL AS CHANGE COMMON INDUSTRY MISLEADING, EVEN MALICIOUS FALSE ADVERTISING, if enough of us take them to task....
>>> Anyone who has bought (or plans to in future) a hose, quick connect fittings, ect, have likely, at one point or a multitude of times, purchaced product(s) advertised and labeled 'brass' fitting, coupling, threaded >
MAJORITY OF PRODUCTS ARE NOT SOLID BRASS! Which is a problem. Typically, they advertise as Brass, however they may only be coated with brass and are some other metal, such as Aluminum!
I had, over the past several seasons, (LOWES, MENARDS, ECT) purchased 4 100 foot sets of 5/8" dia. Garden Hoses (50'x2 sets), over 30 pieces of 'brass' quick connects (inline shut offs, male, female), ect.
These quick connects were super light, almost like plastic now I know what solid brass weigh. Odds if you have had metals fused together, with all brass colored fittings > you may have been duped and should try to find what mfr you bought by revisiting stores and checking hose and fitting stock.
False or MISLEADING labeling stating, "Brass" which have fused have undergone galvanic corrosion aka bimetallic corrosion an electrochemical process in which one metal corrodes preferentially when it is in electrical contact with another, in the presence of an electrolyte.
Contact the mfr and tell them their mislabeled MISLEADING 'Brass' is not solid and caused an almost total loss of everything connected to.
I was shipped solid brass quick connect pieces and all new hoses, with legit solid brass.

Good PSA on your part, I always use Teflon tape, which works.

If you have already been "had" don't call the plumber yet.
I had bought myself one of these as a housewarming gift. We moved in in July and it worked great until I went to take it in for the end of the season.(In Kansas City every house owner is either told or they learn the hard way that you don't leave a hose hooked up over the winter.( you may think all of the water is drained out but having that hose hooked up when it gets down in the single digits is asking for trouble)It would not come loose I had two pair of channel lock plyers exerting way more force on the hose bib than it should have to take. Well that is where some people would call a plumber, take it from a heavy equipment mechanic I can tell when something is a lost cause. There is no way that the hose will ever be unthreaded from the hose bib(the two have been electrically welded together) If you have one of the homeowners most handy tools all may not be lost.
I cut a slit through the fitting across the threads with a cutting wheel on a Dremmel. Be careful not to cut the threads of your hose bib, it wont make a lot of difference if you knick a thread or two but if you do be sure to use Teflon tape to seal the threads next time.To my surprise it didn't free things up even when I had an one eighth " slit all the way through.I had to cut two slits 180 degrees apart and then the two pieces could be pride off (like I said it was welded on there)I imagine that if you already have the hose that you can still use it but I would either wrap the threads with Teflon tape or put a good coat of anti sieze on the threads.I am sorry for running on but we are 3 weeks into the Corona Virus mandatory Quarantine and I literally haven't spoken to another human being.
Good luck everyone