if you think that 90% of athletes aren't doing / taking something that is either banned, or will be banned in future you are deluded & the whole TUE rule just makes a complete mockery of any rules they have in place anyway.
Have a pollen allergy, that's ok take some triamcinolone, anyone else takes it they are banned.
Have asthma, take some sambutamol, anyone else takes it they are banned.
Have a heart condition, sure take some meldonium for years, anyone else takes it they are banned
Say you are dehydrated because you had to cut too much weight, that's ok have a load of stuff injected directly into you through IV the day before a fight. The fact that this can also be used to mask other illegal substances doesn't matter.
some of the worls top athletes are apparently some of the most decrepid human beings alive, they all seem to be Asthmatics with severe allergies & heart conditions...
either test everyone every single day or accept that everyones at it and let them get one with it