Some anchors seem to work better for 3 under than for split. Examples are touching the cock feather to the end of (or under) the nose, and thumb knuckle to earlobe.
If you have only a limited range of distances you intend to shoot, for example, 15-30 yards, you should be able to pick an anchor that gives you a point on somewhere in that range. If you intend to shoot a broader range of distances, for example, 15-60 yards, then it is convenient to have a close point on and a long point on. For example, my regular anchor which I have used for years gives me a point on of about 45 yards. I recently have started using a fixed crawl, which gives me a point on of about 25 yards. Having this option has greatly increased my accuracy at close distances.
I suppose if you shoot instinctively, you probably don't care about this. However, I wonder what instinctive shooters do when they're shooting at their point-on distances? I would find it impossible to ignore the arrow point if it was right on the target, and if I couldn't ignore it, I might as well use it. I suppose it's possible that true instinctive shooters do ignore their arrow points at their point on distances, but I don't know how they do it.