While I personally think character unlocks in fighting games (or any other game with non-cosmetic characters) should be a thing of the past, I do think that platform fighters specifically could still utilize unlockables by having all the content competitive players would want by default (every character, all the Battlefield/Smashvilley stages, a few more Yoshi's Story/Dream Landy stages, the primary alt costumes, the more basic items and alt modes) and then allowing players to unlock either casual or cosmetic content (the Templey and Pac-Landish stages, certain items, special mode options, a few extra alt costumes)