Exactly, this is like the NFL of theater nerds. Some of these theater nerds end up not that unattractive but still carry the slight build and fricked up mental states we all experienced in our local high schools.
I believe most actors are short, as state earlier, so that they can appear in the same frame with actresses. It would look funny if a 6'4 man were to kiss a 5'5 woman. I don't believe you could put that on screen. I know this because my wife is 5'5 and I am 6'4 and I rarely even try to kiss her while standing.