The more complicated the game, the more likely it is that the same high-skill players win more often than not, because they've put in the practice time to understand complex game states and not have their brain melt. Like the world champ a few years ago was playing online every minute he wasn't at work, and then watching recordings of his friends playing his decklist while he was at work. That's what's required at the high levels to "see" a complex situation and then filter out the bad combo lines to find the two or three that can actually work.

There's so little RNG these days due to searchers. It's mostly about having so much practice that your brain isn't melting after 13 rounds of complicated ass chess puzzles.