It’s a safety thing, an extra division thing, an extra police who can enter thing, a sport mindset that height alone equals difficulty thing.
I wanted the same - some technical challenges at lower heights. The big problem is that people assume low height means easy and inviting to a young or green horse. Anyone daring to build a more technical, low height course would face lawsuits for excess difficulty when someone failed to actually read the division descriptions, entered the wrong class, and got hurt (because they lacked the sense to see what was in front of them and say nope).
But it would be so much fun! (For those of us who have experience and skills to manage technical questions without the desire to jump higher).
