Firstly, I am raid equipped
Secondly, still EPIC fail
The adornments improve spell lines way beyond the previous set bonuses which required multiple pieces for a single bonus where now you get multiple bonuses for multiple pieces and need only 1 piece to obtain any bonus you want to invest in. No reason adornments shouldnt be only allowed on raid gear.
I will say though that any gear with red adornments should be unequipped automatically in heroic instances. It provides an excellent flagging system now for the devs to disallow trivializing heroic content with massively overpowered gear for the content.