Ah, but you are mistaken my friend. The Muramites come from not another plane, but an entirely different universe, one that the gods themselves didn not know about; one of chaos and infinite war. Thus, it's not strange to see that armor coming from a universe where they have been at war for eternity is stronger than the piddly stuff we have.
Elemental quested armor was supposed to be the best you can get I mean come on, in order to craft the tunics you had to acquire timeless tunic patterns from the Plane of Time now how is something from a lesser plane of existence (considering the Gates zones are technically still part of Norrath, correct me if I'm wrong) gonna be of higher quality, when I look at this tunic I don't think "Wow here is a great tunic" I think to myself "Wow yet another item better than the 'best' item I am currently wearing Bidilis' Hauberk of the Elusive, just a new toy to try and keep me hooked on playing Everquest." Why not something more interesting like deeper quests with more enriching storylines? The items they are coming out with are too powerful, before long the mobs in the game won't even be strong enough to stand up to the players equipment and you'll see Wizards tanking in the Plane of Fire without the aid of Rune spells. Just my thoughts /rant off.
You should read up on the storyline of GoD, it sounds like you seem to think that Plane of time is the hardest zone in the Game apparently you have never done any serious raids in GoD, its harder then Plane of Time, therefore its assumed that better stuff should drop. (reward vs risk) If stuff sub-par to plane of time dropped in a zone that is tuffer then plane of time, who would want to go??