Holy cow people
Number 1… it is OPTIONAL!!!
Number 2… Let’s talk about all the imported big moving warmbloods who might still have a show career left except if you put them in a double bridle they lose their minds and try to commit suicide by flipping over, but will happily piaffe’, passage, and do 1 tempi’s in a horror of horrors, snaffle bit with a plain cavesson. Correctly, with joy and impulsion and harmony and floppy ears. Let’s talk about the hapless ammie’s who want to move up, trainer needs their custom and they should NOT be punishing their horse with a double bridle. If their horse goes badly in a snaffle, the scores will reflect that and Mr/Mrs trainer can say "see, I told you we needed to work on x before you and Snuberfuven moved up.
Number 3… The European contingent is laughing because you all think this is even something to be worked up about.
Number 4… a very very well respected dressage trainer once said when asked why he rode daily his best horses in a snaffle "if you can’t do it in a snaffle, then you haven’t learned it correctly. "