The argument from Scott Adams is about generalists being better than specialists is in regarding becoming useful/resourceful enough to the point people will pay you for your skillset. No one gets outstanding recognition for being in the 95%-ile.
I remember a piece on Donald Glover where Glover described discovering a “superpower” that went on to define his life when, after getting his ass handed to him in a casual basketball match as a kid, he simply practiced shots for a few hours that evening, and the next match went very differently. He doesn’t come out and say precisely what the superpower was but I took it as “literally try at all, and put the tiniest amount of thought/focus into how you try”. The implicit observation is similar: going up tens of percentile in skill-level isn’t that hard, because most people don’t thoughtfully try or put in any practice time at all, even those engaging in the activity. Won’t make you elite, but start applying that goal-oriented-practice attitude to several of the kinds of fuzzy activities mentioned in this piece, and you might really get somewhere.