We don't say symmetrical we say mirrored.

Any Poser character topology that's not mirrored left to right your hear people making morphs ,maps ,weights etc etc complain about it.

There's one Poser character you hear them complain about a lot. can't think of her name.

but any DAZ Poser character that has a prayer to survive past tomorrow. the topology best be mirrored and centered.

or that character is doomed to failure.

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance