Matt i personally do not take any offense. The reason for 3U for me is two fold, first, its how I have been shooting since I picked up a bow at a young age. I shot my compounds bare bow, 3U. Secondly its about shrinking point on. I am MUCH MUCH more accurate when my point is only 17" below my point of aim as opposed to 36". Then the facts of the matter is almost all if not all of the big tournaments that don't allow face or string walking are won are by 3U shooters and that is not an accident. You can be much much more accurate at the shorter ranges.
I have not experienced "harder to tune" perse because for me its what are my arrows doing out to 35 yards. NOW WITH THAT SAID, I do notice better arrow flight with split, but since I have 24 years of shooting 3U I am NOWHERE near as consistently accurate with it. I can not stack arrows on top of each other using split YET, I will get there, I just have to re-learn my gaps. for ME it was all about consistently being able to touch arrows from 0-35, and I can hold my own out to 55. after that its guess work.
The noise i could hear up close, but when I asked others to listen, they never could discern a difference. I am going to focus on some blank bailing using split and re teach my self.
As far as back tension goes I 100% agree with you, although most 3U shooter will not. I too anchor index in the corner of my mouth but I am going to re-learn middle finger to drop the gap using split.