I am wondering, what does that do with value “hiking”, as others have said:
Everything that is now graded “hiking (T1)” will become due to reconsideration?
In another topic I toyed with https://routing.spline.de/ - much like all the three routers on the openstreetmap website their pedestrian guide routes a way, that I personally would not dare to suggest to my elderly neighbours. It is steep, incline=30%;surface=earth tagged and gives ETA only beatable by seasoned walkers. Apart from steepness, there are no technical difficulties there. Tagging sac_scale=hiking in addition might make a difference though, when sac_scale=strolling would be introduced, would it?
After all though, I would have expected incline to be much more popular than sac_scale. If that gets ignored, why bother with esoteric tags?