Not everyone has the same degree of autism. Well functioning children for example may not need any treatments. On the other hand, entirely non functioning children, who are depressed, so easily over stimulated that their lives are actively difficult, etc I would be shocked to see someone claim they should continue to suffer and reject potential treatments because others feel like their own autism doesn't cause any issues.

I even know people who have their autism well under control who would have had much better childhoods and be happier today had there been better treatments, and would likely accept some treatments now given certain effects were possible.