I have been shooting one pin for a very long time. I use to take all pins off the sight except one and sight for 25 yds and practice at different ranges, I would hold over or low depending on range. I never shot competition or anything but I went on a 3d shoot one time and took first place my very first time out, all using one pin and shots were out to 50 yds, all done with hold over.
For a few years now I have been using a slide one pin sight.