You are confusing bodybuilding, which has an aesthetic goal, with weightlifting/powerlifting, which has functional goals, hence the names. There is, of course, somewhat of a continuum. Just look at pictures of olympic weightlifters in the lightest weight groups and what they lift. This is pure explosive power and coordination, as those lifts are very complex. Then you have powerlifters, who still aren't very bulky and do complex full body motions under high load. A bodybuilder, however, does many isolated repetitions (with little weight) to cause muscular hypertrophy. /r/fitness, by the way, advocates functional strength training.

I assure you /fit/ is all about aesthetics.