Shadz - you're right, I wasn't being serious about the Dexter ring! Only in that 'thank God' is probably what so many riders say these days, because they sure can't control their horses without them. Must be some really shite schoolers out there - personally, I find it very disappointing and also disagreeable to see so much paraphenalia decorating horses these days. Jeez, think back to the 1950s (okay, I know, most of can't actually do that, but you get the gist!) - snaffles, barely even a decorative Cavesson in sight. Then, decade by decade, more and more junk has found its way onto horses' heads - keep the tongue down, keep the mouth shut, stop it looking behind, stop it looking down, stop it looking down and behind, keep the mouth shut and stop it looking down, behind, and also bung in a Dexter ring in case it tries to blast off. I imagine sheep farmers are delighted with thousands of cheekpieces and shadow rolls being used all the time - profits must be well up!
I don't mind horses being put into a stronger bit where they really are mad bastids, and perhaps have already had their mouths ruined by the tugging and jagging that some suffer early on - as per our comments about persistent jagging in the parade rings (which must then go on all the time in the yard, as a habit caught by the groom), and no doubt the mouth's jig-jagged all the time when ridden, too. Trainers ought to be more on the case of this behaviour by riders, though, and you've really got to lay the blame at their door if horses are hard-mouthed, reckless runaways.
I don't like the Dexter ring, because as you say, it's being used as a lazy cliche instead of decent hands, but now and then I wouldn't mind seeing a mild port bit, which will depress the tongue anyway (no need for ladeeeze tights!), with perhaps a mild curb, to bring the head in. Something like a Kimberwick, which, with its D-rings, doesn't apply harsh leverage. The nutcracker action of the snaffle isn't that mild, as we know, when it's being mishandled, so I can see why many heads are up and mouths agape as the horses try to avoid having the edges of their mouths pinched painfully. Better hands, better horsemanship, that's the answer.