Have seen many track athletes wear singlets with no issue. Maybe it's because it's their choice? Like already stated, have seen many 2 piece i really liked that fit well. Others, usually fight shorts, fit too loose and didn't look as good. Have seen hands get caught a bit but nothing major or worse than at practice. I wonder if the ability to choose is as big a factor as the singlet itself? Heck, down the road the trend may be a preference for singles? My opinion, let the teams choose and hopefully that helps grow the sport.