When I was in Little League every team had “that kid”. He was probably the coach’s son and had gone to the batting cage often enough to hit hard. He could rope balls into the outfield or reach on an inevitable error. He threw a curve, so was basically unhittable as a pitcher. And he would rotate to shortstop when his arm got tired on the mound. He was playing to be eligible for the all-star tournament where he’d play with other kids who could throw curveballs and had spent evenings at the batting cage.
Some of those kids go on to play high school ball and learn their curve isn’t sharp enough to fool hitters at that level. So they will find another position, maybe shortstop, to cover. If they are skilled enough hitters or show promise as they grow taller and stronger, they’ll get offers from college coaches or maybe even looks from big league scouts. But the odds other players will be stronger and more skilled so they will never be “that kid” again. Maybe they will grow up to coach their own kids.
Then there is Shohei Ohtani who pitched 6 scoreless innings with 10 strikeouts and then hit three home runs to clinch a trip to the Worlds Series:
Now he didn’t move over to shortstop (the Dodgers already have an excellent shortstop) but he did rank #1 (as a batter) and #2 (as a pitcher) in Win Probability Added (WPA) for that game. There’s nowhere else for him to go.