Teaching aid? No.
Double bridles are great for refined aids when in the show ring. They are great for ammys on powerful schoolmasters as well.
For me I school my intermediare horse in a snaffle about 90% of the time. It is too easy for him to fake a good contact or get backed off the hand in a double. I ride in a snaffle and then I know I have a good contact. I only ride in the double about 2 weeks before the competition, then back to the snaffle for a week, and then the double for the competition. In lower level comps where a double is not required at FEI, I prefer to compete in a snaffle as well.
I think it is a good skill for a rider to be able to use a double correctly. Honestly though they will not teach a horse anything. The rider teaches the horse. If the rider hangs off the horses face, then a double will "help" for a while, until the horse either stops, or you need to up the ante again. Its nice to have in your toolbox, but should not be used as a bandaid for poor riding or training.
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