I think you're very very wrong.
Especially in maths, there's not much to practice.
There's stuff to understand. And while this might be exhausting it's not boring and it's a very rewarding process in itself.
Or programming... What's there to practice?
Really. I'd like an example of something that's boring.
My impression is that if you follow the path of discovery and applying things in context, there's nothing that's really boring.
Difficult things aren't interesting locally, you have to practice boring things in order to do interesting things in difficult subjects. Some kids do practice boring things if you just ask them, but most do not.