fixed that for ya
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it is still there to encourage people. besides 2 trials that are needed for the relic are quick and simple (even when the whole party is on level) as well as part of the duty roulette, AND done very very quickly there is no real need to have players do Dhrome chimera or hydra.
on the flipped side however, the EXTREME modes do not have use of the duty roulette, instead there 'story' missions do, this was to make sure there MSQ slots were filled. so what about the weapons, easy, it is to entice players to go back to the old extremes and beat them, as well as T5, T9 and T13. as for iron works, IW is meant to assist from lvl50 to at least lvl 53. so the weapons are done to assist in queues and to have players work togeaver to do old content, for said weaponry.
as i said above the relic quest dosn't really do this, with the exception of 2 stages, but even then, the dungeons chosen no one is going to do them, as you said not part of MSQ. so it must of been seen as a waste of player time.