I don’t really buy the disc danger. I’ve heard of riders being injured by spokes, chainrings, there’s even one rider skewered by the lever from a thru axle, but I have yet to see an actual disc injury with an unequivocal “smoking gun”, a bloodstained disc in the vicinity after the incident. Every injury seems to involve someone who is convinced that a disc did the damage, but there’s never any actual proof, as far as I’m aware. I have seen YouTubes of someone trying to cut things with a spinning disc, to little effect