Well, Bean, would you then also prefer that helpful become helpy? [emphasis added]

It's the become part of your statement that I disagree with. It never became "healthy" here, it always was "healthy" and "healthful" is new to me. BTW, the "healthy food" or "healthy vegetables" usage is in my Canadian dictionary, so it's not just that I personally have been using it "wrong" all my life!

Besides, I think we've all gotten the gist from this Board that "wrong" is relative. After all, I do have a Driver's Licence*, not License!