So, I faced many issues with the guideline where you will face conflict with the marketplace QA & production pipeline. Now I haven't complied the entire list, but one of the guidelines that has bothered me a lot. That is Centered geometry.
Now in case of Modular assets, in many cases you would rather want your pivot point to be placed at the bottom corner of your model not at the center. This rule there creates an issue with models rating, but users will expect the modules to snap accordingly. To let that happen it gets hard to follow the guideline of CGTrader.
There are many other cases like this where a blanket rules like this hurt a lot. One of the rule is watertight mesh. Now for 3D printing it makes sense, but regarding game assets in many cases you would rather have the polygons removed that are at the back/bottom and not showing up for optimization's sake.
These are two of the rules that have caused me a lot of issues. I am saying because even though my model was made following the industry production rules, it faces issues with CGTraders QA guidelines.
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