Nothing in the OP implies that kids shouldn't learn other things as well. I'm sure you meant your post in a good way, but this probably falls into the category of shallow dismissal (https://news.ycombinator.com/newsguidelines.html).

It's all too easy for the top comment on a Show HN post to end up being a dismissal of the entire project - this is more the fault of upvoters than commenters, because the meaning gets subtly (or not so subtly) a lot more dismissive when it's stuck at the top of a thread. But we really want to avoid that on HN, especially when people are sharing their work.

I think your pushback is reasonable, but I want to speak up in defense of delis-thumbs-7e's comment, which I don't read as dismissive in a negative way.

In fact, I'd like to suggest that he's championing free range childhood by not making decisions for young people who might very realistically resent it as adults.

I know three people with perfect pitch. One of them thinks it's great (and is kind of annoying about it). The other two are constantly telling people that perfect pitch just means you're always exercising patience when your friends are singing, counting down the moments until they stop.

That sounds like a version of hell to me.