only thing that make would make sense is if they came out and said:
we have noticed that our employees, friends, kids, celebrities, and family within the vivendi corporation that attempt to PVP without having engineering are at a huge disadvantage against stealth classes and stealth VS stealth situations. we also mostly play alliance NE and HU which our latest changes reflect and want to maintain the stealth superiority we have built in these classes and not have it negated.
i have no 80 or a high level with engineering, if i did i would be furious, as most 80's do the engineering for the epic head piece and mostly with PVP in mind. now it's just a epic head piece that one gets to wear in your 70's.
now that i come to think of it? was stealth adds nerfed from other items, trinkets, boots, or enchants in the game?
rogues/druids can sacrifice a good cloak enchant to get just "stealth" on a cloak
a JC could equip the lvl-70 panther blue trinket from CE has +1 stealth, the lvl-70 panther epic trinket from shattered sun has +1 stealth, or green panther trinket with slight stealth
other players could also equip "the master's treads" +1 stealth, nightscape boots +1 stealth, etc etc.
gee......Blizz....WTF? here are situations where players can wear gear that is inferior to gain a advantage or lose stats to gain stealth