Tim Guetersloh mapped Yellowwood (TC Steele).
I see the symbol used both ways. Vladimir Z. still maps certain steep sided but easily crossed reentrants that way. I believe there are examples at Sharon Woods (I changed one to dry ditch for an event but (hopefully) reverted that edit afterwards), and at Camp Friedlander, where it adds to the confusion sometimes.
To me, the thing that makes it wonderful at TC Steele is that the reentrants can't easily be drafted at 1:15000---the iso-elevation width is just so small sometimes (what, 5-8m?, so 1/3 or 1/2 a millimeter?), that drawing them with contours would look bad.
Also, I am usually a fan of drafting the linear stream network beyond what is commonly drafted. I need to talk to some really good mappers and find out why that isn't done more.
I've tried to think through strictly applying dry ditch (dots) to stuff that is crossable by most people, and gully (coarse line) as stuff crossable by M21/F21 but not necessarily older people. But I don't really favor that universally, particularly because I regularly see very shallow reentrant details rendered with dry ditch, and adjacent "crossable" ditches mapped as gully, and it really makes sense to me that way.
Really good discussion topic, though.