Believe it or not, aeilkema, I agree with you for the most part.  It's not necessary to use Zbrush.  It's not even necessary to know all there is about topology.  However, this is why a fundamental understanding of edge flow is important...

http://www.youtube.com/watch?v=k_S1INdEmdI

Someone without any knowledge about how to properly model a human face, for example, will likely end up with a model that will not deform properly with expression morphs, contain artifacts, and render issues.  Anyone can sculpt a box into the shape of a face, but will it be able to smile, and emote without artifacts?  This is what i'm suggesting some people don't get, and how it can be bad for creating characters in Poser, especially now that we have new features like Pixar subdivision.  I'm not saying you NEED formal training, and sure, some static models can do just fine with ngons and any old topological order.  Cartoon or NPR characters, for example, can break the rules of edge flow, and still be just fine.  However, if you're modelling realistic characters, and want them to morph or animate, or even rig easily, then topology becomes an issue.

I suggest anyone who "doesn't believe" topology matters, watch that video for evidence of just a few reasons why it does.  There's other reasons too, like rendering with Path Tracing, where long, unsupported edges can cause render artifacts or black spots, etc., etc.  Or rendering with Poser's own IDL, where overlapping edges, or single-sided geometry can cause issues.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.