Exactly. Many years ago we interviewed a top USET vet about using medications wisely. (I think it was for Dressage Today magazine when I worked for them.) Basically she said that just like human athletes might take ibuprofen to help with muscle soreness after working out a little harder or doing something new, that CORRECTLY using certain medications for horses will help them work through the soreness issues from using new muscles as they progress up the levels and learn new things.
From what I understand from the top athletes, they agree that there should be a level playing field, and they're not advocating use of currently "illegal" substances to give their horses advantage. They just want to make the horses comfortable. I mean, no matter how good shape a horse is in, he's probably going to be a little sore and tight after being asked to jump several technical and large courses over the span of 3-4 days--sometimes more than one in a day! It comes down to what's fair to them.
Of course, I also see the other side of it that one bad apple will spoil it for everyone else who wants to play fair. At the very least, I just think there needs to be middle ground in the decisions made by the tribunal, particularly in those cases of accidental contamination. And as testing gets more sophisticated, I think we're going to see this become even more of an important issue.
I did see that an FEI committee has been formed to look into this and discuss options. I wish them the best of luck and hope they come up with a plan that's in the best interests of the horses. I'll keep you posted if I hear anything.