[sireat]

Agreed that you need both talent and deliberate practice for chess but you also need to start early.

For becoming a chess GM you need 3 things: talent, grit(deliberate practice), starting early(10-12 is okay, 18 is too late these days).

One interesting aspect of starting early AND also persistent grit is being the youngest sibling in a chess family.

For example Hikaru had a master level older brother and of course there's Judith. The youngest siblings are ridiculously competitive against older ones.