This post concerns itself only with 5-man instances. Forget about raids for a moment.
Do you think its okay for a group member to roll need on an item intended for their class, but not for their particular role in that group? This could be a pally healer rolling need on a dps plate item or a warrior tank rolling need on a two-hander or a shadow priest rolling need on a +healing cloth item.
I think it's perfectly fine (!) - but the most common point of view in these forums and in PUGs seems to be that this is the worst, most despicable form of ninjaing you can commit. "OMG, you didn't equip that item immediately, so you don't need it!"
We all know what it's like to be grouped with a pally, a priest and a druid and *still* be looking for a healer! It's equally frustrating for them to be grouped with a warrior who could tank, but doesn't want to. We all want the group to work, and I think it's commendable if a dps warrior agrees to tank or a balance druid agrees to heal if that's what the group needs - assuming they can fill that role of course. And those people probably want to go back to dps, or whatever it is they do, as soon as the instance is over. I still think they should be allowed to roll need on an item they need for all other situations than right now.
And I haven't even gone in to how hard it is to re-spec if you can't acquire the *first* piece of gear needed for your new spec.
I think: Stop punishing your group members for assuming a role for the benefit of the group!
But what do you think?