Every beginner Diablo 2 player puts one point into every skill, instead of focusing on 1-3 main skills that should get 20 points and 1-5 points into secondary skills/"one point wonders".
Slay the Spire addresses this via the randomness of which cards are offered, which means that you have to design a deck without being remotely guaranteed to receive the cards necessary for whatever meta deck you have in mind. Unlike Diablo it's also exclusively a single player game, so there's less pressure to compete and more freedom to just have fun.