Well... there will always be an argument for what's "necessary" and what's "not". This isn't really about that. This is about being better at what you are doing.
Ideally, you want to get through a map as fast as possible. At least in my opinion. The best way to do that is to have all the mobs in one place so you can maximize your damage per skill use. Thorn wall does root the mobs, but there are other advantages to beckoning. Pinning them to walls prevents other skills like stomp, firestorm, or repulsion (if used appropriately) from scattering your enemies.
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