Is that really a true statement though? ITF TKD has its silly stuff too like sine wave movement, and the school I visited (not ITF but clearly with an ITF heritage) did lots of sport sparring with no boon hae practice that I could discern.
It's so hard to generalize... In the end it's all about the individual instructor and what they want to teach. You're a lucky one if your instructor actually chooses to teach meaningful self-defense.
Not to start another topic - but if you've never done sine wave properly, you don't know what you're talking about when you say "silly stuff too like sine wave movement" - sine wave (moving up and down) is a natural movement (when taught properly) and is clearly visible in other fighting styles, most notably in boxing, as is the other side of sine wave, spring style (using the hips to generate power). Has it been taught incorrectly in a lot of places? Sure - but so have lots of other, equally valid techniques.
It is, indeed, hard to generalize. I started in the ITF, and part of my I Dan test included a 2 minute demonstration of hol-sin-sul techniques against a moving opponent - not kicking and punching, but releases, throws, and controls. It was a preset routine, yet it was something I had to create myself based on my own understanding of the principles involved.
The association I belong to now requires the teaching of hol-sin-sul at all levels, beginning with falling and rolling, along with some simple releases, at white belt. Most of what we teach came from Hapkido, and complements the kicking and punching aspect of what most people think of as TKD quite well - the principles are the same. It all depends on what the seniors in the organization want, how they teach it, and how the instructors integrate it into their regular instruction.