I understand your point, and don't want to get into a ‘this sport vs. that sport’ thing - since they all have problems (not so sure about bowling or Pee-wee golf). However, when I've gone to MLB spring training there still are a lot of normal looking players of average build who don't look like they are juicing. It's a sport in which a skinny guy with good skills and heart can still succeed. When I think of baseball and the ability to be great based on natural ability, hard work, and heart, I think of Ernie Banks.
Doesn’t mean those guys aren’t juicing for speed getting around on the ball.
People are always surprised when the scrawny, marginal players get caught, but they’d likely not be in the league without the boost.