One of the questions I have continually thought about is what I want a roleplaying game to be like. What are the optimal features that I imagine in the "Hypothetical Favorite RPG"?
Non-binary success
After the players roll the dice is isn't just one of them succeeds and the other fails.
Examples
Wagers from Houses of the Blooded
Arbitrary Character Elements
Your character should have things about them that give them mechanical bonuses which are character based and can be almost anything that the player wants.