What argument. You are arguing with yourself.
So what if they choose to set a different standard for initial to renewal? The line has to be drawn somewhere and thats where they have chosen to draw it.
I am an average beer drinking pie eating member of the flying community and I passed a Class I medical. If I had failed should I have asked them to lower the bar to fit me. How far do we ask them to lower the bar?
Lets see, we ask them to lower the hearing bar so you can pass, then we ask them to lower it again so those who are colour blind can pass. What next we ask if they will lower it for those with high blood pressure or diabetes?
Yes some people might need an medical every six months and I am sure those people would still pass the initial standards. In 10 or 15 years they might not and so a little allowance is given for the effects of age. Seems reasonable to me, or are you saying we should keep the initial standard for ever? No I think what you want is for the standard to be lowered to meet your perception of what is right?