This is the latest on Trails & Markers. Before this, the trailmarker-o-meter was the rule of thumb.
If this min/max distance was co-opted from an appeal decision, it would be inaccurate to use this as the standardized treatment for all markers. The decision of that one appeal may have context unique to the POI in question.
That said, each trail and accompanying markers has its own unique context and difficulty in submission/reviewing. The existing clarification highlights the need to make the eligible markers distinctive from the others of the same set. Sadly, the clarification is limited through one image examples but there is an element of the submitter’s content apart from the marker’s context to highlight this distinctiveness. The variability of trails is a strength in the real world but another hill to hike over in Wayfarer. That also accounts for the inconsistency in decisions for these types of POIs.