I think @hankwolfman 's original point is not about safe pedestrian access but about how the object would not inherently meet eligibility criteria. A longer discussion about these can be found in another thread, this reply is IMO probably the best summation of how neighborhood signs can be merited as being eligible or not.
I understand that game objects will be used when available. The reasoning for eligibility is how the object would fit for socialization, exercise, and exploration in real life excluding game interactions.