How to say it without really saying it. So you are suggesting that WADA doesn't follow the scientific advice of their own scientific experts, but rather the scientific advice inferred from the athletes?
What you describe sound impressive, but is it real? "Popular Science" describes a much less scientifically rigorous WADA guidance process:
"the ban seems to be the result of World Anti-Doping Agency (WADA) precautions"
"The process of the trimetazidine ban reflects some of that uncertainty. In 2014, the WADA initially listed the drug as a banned stimulant, but it’s now categorized as a "hormone and metabolic modulator.""
"Scott Powers, a physiologist at the University of Florida who studies the effects of exercise on the heart explained how trimetazidine was included in WADA list. "I've been involved in roundtables with the International Olympic Committee, and I think their policy is: When in doubt, ban the drug," says Scott Powers. "I guess they're just trying to err on the possibility that this drug may be an ergogenic aid.""
These are not ringing endorsements of a rigorous scientific consensus process. Rather, it looks like yet another drug added to the banned list based on a non-scientific consensus of a theoretical "potential to enhance performance".
The best scientific endorsement I can find is that "in theory it could work".
Note that it was available since the 1970's, and scarcely used by athletes. Do we have any athlete anecdotes before it was banned?