One more clarification (which I’ll also add to my post above):
Hard-cast Rend procs Area Damage, while Rend caused by WW/Ambo does not. This means that when pushing, in good density, hard-casting massively increases your damage dealt. I talk about how much of the damage of a “high pusher” comes from AD in this post.
So, just spinning definitely puts a ceiling on how high you can push. But, some people just like to spin, and that’s fine!