It's not though. I had explained why it isnt
You have to be world class in numerous different physical categories just to make contact with MLB pitches. Then on top of having those physical gifts, you need to develop the skills to actually make GOOD contact. So If you dont have these gifts in the first place, youre not going to hit Major League home runs no matter how hard you try, because there is zero "luck" involved.. whereas if you hit infinite golf balls eventually youll get lucky. Pro baseball players are pro baseball players for a reason. They are truly gifted and there arent too many of them who could really just hit HRs like that.
I see what youre getting it, but Youre deviating from the original question. It's whats harder for the regular person to do. Not what's more common amongst the professionals in each respective sport. Apples and Oranges because regular people have different limitations that professionals do not.
Now if the question were "Whats harder to do for a world class athlete?" I think that would be much more debatable and youd be onto something..