Train like practice matters. Never tell anyone they failed for not grinding.

Practice matters a great deal, but in the biggest analysis it explained about a quarter of skill differences in games and a fifth in music, and less elsewhere. Train like practice matters. Never tell anyone they failed because they didn't grind enough.
S Evidence: strong. Large trials or many studies, pointing the same way.
C Evidence: contested. The research disagrees. Named, so you can stop worrying about it.
Macnamara, Hambrick & Oswald 2014 (157 effect sizes). How to interpret it is still argued.
Not medical, legal or financial advice.
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