Don't forget bluffing and hand tracking. This game has so many skill layers that base players don't even come close to understanding. For instance I can hand track thorough intuition but firebat actually knows which cards have been held from which turns and can predict what they're holding with high accuracy.
Also someone said 5 years ago it took 100 games just to reach rank 5 and now it takes them 50 to get somewhere between 1-5... And used this to say it's rng based.... How? Likely in 5 years your skill got better and they changed the laddering system to make it softer to get to legend. Lol.