I never knew our lines could be ruined by flattening, is that accurate..? I've always heard about "rope flattening devices", but always took it as more of a personal pet peeve than an actual abuse concern. Yeah technically speaking, pinching/crushing/smashing rope between two metal objects should always raise an eyebrow, but aren't our climbing lines as well as devices designed around this exact idea? The idea being that our much needed friction may be applied by pinching it between two smooth/contoured objects, hence they design the rope to be able to take that sort of abuse..?
To follow on others responses, i too see my NER 16 stand flatten like a pancake, but I like it for the same reasons you do J-tree.. I actually just bought a new hank of it VS going with a newer fancy line. Something i don't have to shame myself for NC'ing.
In follow up on the HHX, I've seen mine flatten every rope I've run through it, with 16 strand being flattened the most if memory serves correctly... But again, it's like that by design, if it wasn't ok or ruined rope super fast wouldn't it be shunned by the community just as fast?
I don't mind seeing a rope malshaped so long as the friction device I'm hanging on provides enough friction to continue hanging on the flattened section. Mine fluffed back up given time to relax and dry, tho, so it looks like I'm good. Arbormaster lives to fight another day.