It's a matter of principle to me. You just don't need on items that you don't need. If you do, feel free to accept the consequences.
But to be honest, the problem lies deep in the WoW community now. It's just need if you can need. In cata people asked if they could need for their OS 90% of the time. post-LFR and especially in MoP, people need stuff for OS over other people's main specs. (main spec being your role in the group).