Many kids will do difficult stuff, just not the stuff you'd have in mind. Sometimes parents are right in what the kids should be focusing on, but I'd guess more than not they are wrong. For example, all the parents who discouraged heavy computer use or video games, when this is how most millennials came into programming and IT. Then there's the thing where a kid who is interested, obsessed even, learns SO much faster. I recall a story of a parent who wanted their child checked for learning disabilities and the psychologist exclaimed "Your son has memorized 350 Pokemon! It's not a question of learning ability, it's a question of motivation".

In my view, if we let our children do what interests them, to some degree (of course anything taken to the extreme will likely fail, and it depends on the child), they are likely to cover way more territory, and probably more useful territory, than a child that is being forced and coerced. One of the many things my 7 year old has learned from Minecraft is an entire language (English), to a level which in the past (my generation) we didn't reach before perhaps 18 (and that was due to watching TV, not school). The other day I caught him taking notes on a piece of paper that said single = 1, double = 2, triple = 3, quadruple = 4, quintuple = 5, sextuple = 6. This is a child who should not be speaking English, but now he can write and spell it better than his native language, because we let him follow his passion. He's also learned a ton of engineering concepts and vocabulary, and has the ability to install mods, debug when they don't work, has a basic understanding of networking, IP addresses and on and on.

He has no interest in playing an instrument right now, why should we force him? If the time comes and he wants to, he will learn it so much faster because he wants to get better.