Balatro is one of the best examples of this. The game naturally gets easier as the player learns its systems and gains experience through playing.

Isn't this the case for most Roguelites? It's not even necessarily player skill, so much as unlocking permanent upgrades (Jokers in Balatro, abilities/cards in Across the Obelisk or Slay the Spire, stat boosts and weapon modifiers in Hades, etc.).