It's also often wasteful. You can claim that "there's always more to learn in any subject", but if someone legitimately knows the material, any activity is more

It's also often wasteful. You can claim that "there's always more to learn in any subject", but if someone legitimately knows the material, any activity is more meaningful including playing video games or TV. I suspect many of these people would also misjudge hard work, for example when people self-teach out of interest, well that's just them having fun. The many hours sports star spent on the playground were just playing. The idea in some mind is you have to take the hard way (no short cuts!). I can just feel how smug people are when they say this. So the idea of someone not grinding fills them with blind rage.