A really informative article here in CW -
https://www.cyclingweekly.com/news/latest-news/the-truth-about-cycling-and-asthma-317941
As you say, a lot of Pro cyclists develop exercise induced asthma purely because they are athletes, even when they have had no asthma symptoms previously. Apparently swimmers are the same as the chlorine in the water can trigger a reaction and an attack. Another recent study of professional footballers also showed that a high % (I think 30%) also have exercise induced asthma.
It would be a real shame if when professional sportsmen have the symptoms triggered they are told they can't compete anymore (or risk a big attack and a serious health risk). I mean, how many of us, in our professional lives, would accept being told that we can't do our jobs anymore, even though there is medication to help us, because something in the environment we work in triggers asthma or similar.
He's another angle ... how would we deal with say a cyclist (or other sportsperson) who has such bad eyesight that they can't see their hand in front of their face, but they wear contacts and have pulled their eyesight to the level of 'able bodied' athletes? Do we ban their use of contact lenses too as it improves the performance of the athlete compared to when they don't wear contacts? It's all very grey but I don't think we should start banning everything just because of a few bad eggs who are cheating.