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N'gons are not a problem for 100% flat surfaces. (but the render must accept them, anyway you can do an auto-tesselation for flat surface, the result should always work)
N'gons are evil for organic surfaces...but even for flat surfaces wich are not 100 % flat (example, with chanfers in some cases)
In example Zbrush doesn't handle Ngons but Zbrush detect them and ask you if you want to convert them.
An other example: Maxwell Render doesn't support nGons..the surfaces with more than 4 points are automaticaly ripped off..and so you may render holes !.
The best is to always think about a good modeling.
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