Obligatory “technically correct, the best kind of correct”
That’s how English works. It’s usage. I think the French have a council that decides but English moves a lot faster.
I get having a pet peeve. I for one hate that ignorant means uneducated when it should be someone who is willfully ignoring. That’s just not the way it played out.
I love dictionaries and word usage. “Healthful” is a clunky word, I’m not surprised we moved to “healthy “
Edit: I just realized “helpful” sounds just fine. But if someone said to me “thanks for being so helpy today” I would be a full of seething hatred lol