Another Group Loot Fail - Shamans can't roll on offhands?

Excuse me? Please tell me the difference between shield or offhand besides some armor? Because it’s a VERY minor thing that doesn’t matter that much. the intellect and increased secondary stats are what matters.

If Shammies weren’t meant to use offhands, then why can we?

And also why did we used to loot them with PL??