In part, that might well be because given the prevalence of kicking in Korean arts in general and taekwondo specifically (which is what this thread is about), getting in close and staying in close is counter to some of the basic concepts of the art.
Proper structure and body mechanics make all the difference at ALL ranges.
That's true, though I know I have to say "get in close!!" plenty of times when I'm helping people learn to spar, hahaha. I'm sure you've those kids that try to kick from like 4 feet away.