It doesn't seem to be competitive. If you look at results for major matches nobody is winning shooting minor.
Nobody is winning nationals, shooting minor? At the club level, it would certainly be possible to win matches shooting minor, loading only seven, or whatever you want to do, depending on the competition. I won a local match shooting Limited with a single stack .45 loaded 10+1, but I would agree with anyone who said, "Nobody is winning Limited with a single stack"!