Yes, I agree. There's no argument about that. Where I seem to differ from some of you is that I believe even relative beginners should receive some instruction as to how to defend against someone on top of them. Not in the sport sense either... Avoid damage and get to your feet asap.
Well, we don't really differ since I actualy teach mount defenses at about the same time you do. Falling, as a prelude to throwing comes in at 7th Kup. Since we are on the mats anyway, this is where I teach the mount defenses. I just never considered it truly a part of TKD curriculum although General Choi's text does contain basic throws, grappling groundwork is not present.