Having been a dedicated amateur swimmer for quite a long time, I already know that height (or more precisely, total body length from fingertips to toe tips at full extension) is the single biggest factor determining a swimmer's speed. Every serious swimmer knows this. Serious boaters and boat designers know it too, because of a physics law describing how objects move on the surface of the water. Highly simplified, the longer the object (of the same mass and energy expenditure) the faster it will move.

Also, turbulence sets an upper limit on how much energy a swimmer can effectively add to their effort. At a certain point, adding more energy to the stroke cycle produces more turbulence instead of more speed. So growing bigger muscles isn't the answer.

Height (actually length at full extension) is almost everything in competition swimming. It really would make sense to have class divisions in swimming like boxing already has.

Many more shorter athletes would have the opportunity to compete. And why not? Aren't athletics supposed to be good for us? Enrich our lives? Etc?

And shouldn't trans people be able to do that too?