let's be realistic, there IS a measure of lost initial (and perhaps total) stability using a 2-fletch. the 2-fletch may look cool and will save 12 fletches per dozen arrows, but functionally, for a trad bowhunter, what is the achievement? imo, there is nothing at all gained worthed mentioning and something of prime significance is lost. but as always, ymmv.
and so, this bears repeating for those intrigued by the siren song of the primitive 2-fletched arrow ...
a cautionary comment ...
a "modern" 2-fletch DOES work well, IF all the right parameters are involved - the shooter's form/release is good and consistent, good bare shaft flight under hunting conditions, and the 2-fletch arrows have been well field tested under hunting venue conditions.
the reason(s) for using a 2-fletch? i don't see any that are major functional, and i don't buy into the added quietness. i did my own 2, 3, 4, 6 fletch testing and feather noise has much to do with the feather fletch itself, the degree of offset/helical, the shape and height, AND your release. i mostly use a 4" banana low profile 4-fletch and it offers as little a 20 yard downrange noise as 2 and 3 fletched arrows of varying shapes and configs.
the reasons for more than 2 fletches can be summed up in one word - "insurance". faster arrow spin, quicker paradox recovery, added arrow stability.
there are bowhunters who should not even attempt a 2-fletch 'til they get all their ducks in a row, first. and even so, yer adding another measure of concern when out hunting.
this is NOT to knock those who know how to use a 2-fletch - just as with those who prefer to go trad primitive, it's all viable trad bowhunting if in the right, capable hands.