Son and I have noticed that young pitchers who are seen as being "lean, wiry, thin-framed, lanky, long-armed, etc" are looked upon more favorably in terms of their projectibility for future success (?read: velocity) Likewise, kids who are "thick-framed, muscular, athletically built, or physically mature" are implied to have already come close to reaching their ceilings in terms of pitching. (read: nothing else to do for the kid, and we can't teach velocity) Is there data to support this? Does everyone buy into this type of thinking? Are recruiters now all thinking this way as well? Don't we have examples in MLB to refute this.
-from the concerned Dad of a muscular boy/man