I think a big difference for the guys I know that shoot them is at distance. As fast as bows are now, giving up a little speeds no big deal to some. I personally don't set up for speed, I prefer a little weight. I could go heavier on arrows but stick around 416gr and shoot about 289fps. Works for elk, so I'm happy. I'm not sure what more you can do for better arrow flight other going with 4 fletch if your bows tuned properly.
Yea,I'm not concerned with speed,but the need for more stabilization makes me ask if I'm properly spined.
I tune my recurves and frequently trim arrows in 1/4" increments to get perfect flight. A properly tuned arrow will fly perfectly without any fletching to the same impact point as fletched arrows as long as you don't flub the release.