somewhat subjective and perhaps opinionated stuff.
imo ... bamboo/cane grass shafting is the "carbon" equivalent of natural shaft materials. arguably the toughest natural arrow shafting that's superior to any genus wood shafting. however, unlike wood that can be cut/turned straight, grass stalks almost always require careful heat treating straightening time, as well as rounding off the shoot nodes. unless you buy them pre-straightened and ready to nock, point, fletch.
in the short run, all these organic arrow shafts will never be as consistent as carbon or aluminium shafting. there'll always be an added amount of "luck factor" in their performance.
so, what the hey - i say allow any natural shafting material in trad "period" events.