no, you dont need it. We all used it for a long time before it came along just fine with melee teams.
Rarely ever is it a required thing. I can understand that when you start a fight and the team needs to move one step further IWT may work, and the odd fearing mob here and there, but it shouldn't be a big problem at all in PvE.
and yes, spamming it in pve is stupid XD
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