Yes I must agree with Niknak, those medical exams are a minimum, I rather lose my medical or not be allowed to fly for a certain time, but be able to cure myself and keep passengers and collegues out of troubles.
How many pilots are keeping their little secrets from medical examiners?
hoping it will never be found out? or having complaissant examiners, "yes you landed the plane yesterday, I am sure you can do it tomorrow"?.
Pilots still die or are ill or do not perform well (and I think the latest is the most important the first two are rare occurences) on the flightck because of unfitness or medical condition...
So having higher standarts does not mean you will be never ill, but certainly can reduce the amount of occurences where having a medical condition will prevent you from being 100% on the flightdeck.