No, that’s not at all true. Virtually every baseball player who throws left handed is left handed. There are many players who BAT left handed who are naturally righthanded, because that is advantageous and how you naturally bat isn’t always tied to your dominant handedness anyway* but learning to throw with the opposite hand would be an amazingly hard to thing to and would not confer any advantage.
Throwing lefthanded is convenient if you’re a pitcher but if you want to be a pitcher, using your dominant hand is the way to go no matter which it is. Otherwise, throwing lefthanded REDUCES the number of positions you can play. Lefthanders cannot play second base, third base, or shortstop, and for somewhat nebulous reasons don’t play catcher, gain no advantage in the outfield, and the advantage in playing first base exists isn’t all that significant. It is a disadvantage to throw left handed if you want to advance in baseball and you’re not lucky enough to pitch.
My father was righthanded but played ALL bat/club/stick sports lefthanded… and my mother is lefthanded, but plays all sports right handed. Very odd.
This. I’m right-handed (very much so), but when I was in high school, and took an archery class, I discovered that my left eye is my dominant eye.
As a kid, I was terrible at hitting a baseball, but I was doing it right-handed; when I was in college, and my roommate (who played baseball) learned that I’m left-eyed, he suggested “you should try batting lefty.” Within an hour of practicing at a batting cage, I was better hitting lefty than I had ever been as a righty.
I’m righty all the way down the line, except I have my left arm on top when crossing them. My son writes and eats with his right hand, but throws and bats lefty. He’s also left-footed. I’ve noticed that the things he does with his right hand are things usually done sitting. I wonder now if his left eye is dominant; I’ll have to ask him. Edit: I messaged him, and he said he’s left eye dominant. My Mom was left handed except for batting and throwing, which she did righty.
I’ve used the mouse with my left hand deliberately when I first started using a PC so as to reduce the likelihood of carpal tunnel syndrome on my right hand and arm. I had some mild left arm and shoulder trouble a couple of years ago. It was brought on by something unrelated to mouse usage but that seemed to make it worse. I switched to the right side for a month or two until I was sure the trouble subsided. Then I switched back to the left.