I agree with your point of view, this is CGTraders way of trying to mimic Stemcell, and its poorly done, inaccurate and is not updated when the model is resubmitted. Its a way of trying to standardize things, which is a good thing when it works - even if the artists dont agree with some of those things since consistency is always better for the buyer.
Personally most of the things I make are PBR because why not, it was a standard set back in 2017 and is quite easy to do and transfer models between different 3D software which gives you a wider audience, each to their own however. If you only sell prints for example these ratings are not in your favor and can potentially give you worse ratings even though they might be of high quality.