It also surprised me when very good players were terrible at it. I used to hit both infield and outfield pregame with a glove on one hand bcatching the all a bat in the other hitting fungos one handed (humble brag lol). Not sure why the toss-hand would matter, it's what you do after the ball is in the air that counts. For those that think it's a gimmick, you can't really self-toss and hit a fly ball especially without some form of separation, it just won't work...