Having a very small aiming point, especially one that's a different color can be a target picture nightmare.
There's a few professionals that can hold a bow incredibly still, with a laser attached to their bow, it's just stupid. Most, their pin bounces back and forth. Some shoot a fast float, some a slow float from a heavy, heavy setup. The heavy setup can lead to anticipation. Everyone is wired differently, some can handle it, some can't. Tim Gillingham is one who usually can handle it, there's others as well, but he's the loudest voice on the command shot.
For me, I like having a smaller area to aim, but if I can see exactly what I want to hit, I want it bigger than my pin, stuff disappears behind my pun and it sends that monkey in my brain crazy. I usually shoot a fairly small pin, the large pin/dot that covers the whole 10, or larger areas hasn't worked well for me. I know guys who shoot very well with giant dots. It's finding what works for you.