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Smash Master
I wonder how likely we are to convince Apex (or whatever the next major tournament is that declares rules early) to run two similar but distinct versions of the game?I think the best way to do it is to just treat them as if they were separate games. Maybe one year we could have EVO without customs and the next year with customs, if possible run both in the same year. Other majors mostly focused on the Smash games like Apex could just run both.
More interestingly (and more relevant for more players), what are the odds of convincing TOs who are already apparently stretched to find enough setups, to allocate some to each ruleset (and/or run the rulesets at different times like singles/doubles).