The reason for the revolving door of version names is the same reason the game is trying desperately to appear new. It released with little to offer in terms of balance, despite the battle system looking much better than many games of the same style. Both the difficulty and drop rates were absurd and have only seen minor improvements. You can throw as many top tier character draws as you want at players and it won't change the fact that once that character is no longer effective, the game effectively ends until the next one.