Since I don’t think it was linked in the original post or in your own appeal, I would suggest checking this clarification post out. It may answer some of the questions you have. Once again you are free to disagree, but I doubt you will get any further follow-up from the Niantic team on specific decisions.
The discussion in the first post you link essentially crystallized around public painting walls, which are yet a different type of object from what you are asking about. Fwiw I think these make great wayspots, and I personally have submitted “legal walls” that could be without any doubt proven as such by an external source. I have in 100% of the cases been rejected by the community though.