For all you unwashed heathens, ARMS 5.1 launched this evening, adding Tournament Mode, which unlocks all weapons for all characters!
Why is this important? Well, previous ARMS tournaments were mostly played online by people who had sunk a significant amount of time into the game and unlocked all the weapons. This allows tournament organizers the ability to have multiple setups for a large number of players to set up brackets for multiple matches. This is a HUGE step for the game to start being featured at more competitions, as there has been a debate of "customs vs. defaults" within the community for some time now. Essentially, playing with default ARMS only allowed newcomers the opportunity to refine their skills on each fighter's presets, while customs allowed long-term players the ability to show off their acquired weaponry, which is obtained through a skillshot minigame that requires in-game currency. Tournament Mode allows players to experiment with all types of weapons, but doesn't allow them to boost their ranking online- its essentially the most legitimate "practice mode" the game has.