Actually, no, I'll come back in to say this.
I'd read the phrase 'halter classes' but didn't actually know what it was until I read this thread. I just did not know that there is another discipline out there that encourages looks at the detriment of welfare. It's reminds me of the scandal within the British Kennel club a couple of years ago when a television exposť of unhealthy 'award winning' dogs led to radical overhaul of some breeds standards.
Yes, there have been many many examples of breeding to produce one characteristic at the expense of overall health - heavy draught horses are a good example of this where the ability to pull a plough well came at the expense of ground-covering limbs and lean athleticism - but to discover that there's a whole other world out there that promotes horses not bred to perform astonishes me.
But clearly this debate is one that has gone around HF and back again and I'm just joining very late in the day, so I'll back out now and leave it with those more informed than me.