So, this is an off-the-cuff thought about competitive rulesets taken from other games with character balance issues. I'm also just out of surgery and heavily medicated, so bear with me.
I am a competitive PC gamer in addition to an avid Smash fan, and one of my favorite games in recent years is the somewhat ill-fated Bloodline Champions. It's an arena fighter with WASD controls and an isometric view, highly skill-based and technical. In BLC tournaments for 1v1, they are striving to measure not just one's proficiency with a particular character or strategy, but their skill as an overall player. To do this, each player picks a character, plays a game, and then swaps character for game 2. In the event of a tie, the tie-breaker is a ditto with a 3rd character that both parties agree on. This measures versatility, skill, adaptability and manages to more or less avoid the problem of character balance.
I'm not suggesting we replace the Smash ruleset, but I'm curious what people thought of this idea for an alternative way to run a finals for some events.