I've often thought the exact same thing. I've shown Morgans for years, and in big classes we just didn't have to try and make our horses "show" the entire time they're out in the ring. Quite frankly, I figured the difference was that Mini people just don't really know any better. Sorry, but that's the way it looks to me! Besides showing Morgans regularly I've also been to--and worked at (ring steward)--a good many Arabian shows.
Baiting the Miniatures--now that's silly & just makes Miniature exhibitors a joke to big horse people. The very first time we showed our Minis was at a local fair and the other exhibitors were watching me (yes, I was showing my Minis just as if I were showing a Morgan...no baiting) and they were talking about a sanctioned Mini show they'd been to, and the people there, they said, were actually FEEDING their horses in the ring. They figured it was just the goofiest thing they'd ever seen.
I like my horses to be trained to stand up & show before I taken them in the ring, doesn't matter if they're big horses or little horses, they can all learn to place their feet & "hold it" on cue--with training they all set up just on cues with the lead shank, and if one foot is a little slow on moving into position I just have to point at the offending foot and it moves. I can remember going to a QH show one time & laughing at all the exhibitors that were hand setting their horses and even combing manes in the ring. Or even longer ago, at a local Morgan show, one newbie was out in the ring & actually dropped her lead shank to walk back & place her horse's hind foot--the audience just roared with laughter, because hand placing just wasn't done...even if one kept hold of the lead shank!
Baiting...I've always wondered why it is necessary. I train with treats at home, but in the show ring my horses are supposed to show interest when I scuffle my gloved fingers together in front of them. I might even pick up a bit of arena dirt and trickle it in front of them and have been known to pick a tiny bit of arena grass & trickle that in front of them--common tricks when showing Morgans, but allowing the horse to eat that grass was strictly forbidden. Eating = unattractive mouth movements and yes, even some slobbery stuff to mess up that nice clean muzzle... My horses always get a treat when they come out of the ring, and well they know it too. But showing Minis...everyone says you HAVE to take bait into the ring with you... Shakers & noisemakers....sorry, but I think they should be banned from the ring! You know what makes my horses look alert & really show off their necks & ears? A cell phone ring. Can I take my cell phone into the ring & play the various ring tones when I need my horse's attention????? That's about what it comes down to it seems.
And the gyrations from the handlers. It wouldn't be so bad if all those gyrations actually did some good, but from what I've seen...they don't. The horses become oblivious. Now, I've seen some Arabian handlers that have some real moves too, but it's not quite the same...I can think of one guy that could stand in front of his horse and lean way back--think of someone that is very good at doing the limbo!--and as he leaned over backward, his horse's head would follow--the further he leaned, the more that horse swanned his neck. Now that was impressive, and it was training--it worked every time.