I've gotten a bit tired of Samurai.
He seems to only have a vague sense of where he wants these games to go but his decisions are largely untenable or hard to understand. For example, it makes sense to me that he wanted there to be a swimming mechanic, as having a new terrain interaction could make combat more interesting. Unfortunately the way he implemented it was completely asinine and useless. Characters are completely unable to fight while they're in the water so swimming serves no real purpose other than seeing them get swimming/drowning animations. It's a completely pointless addition.
If it were me, I would choose to give the characters the ability to fight underwater. They sink to the lowermost platform and fight the same way, just with some lag to their movements. Double jump is replaced with an infinite "swim" jump, ala Mario Bros, where pressing the jump button continuously causes the character to rise, and they can swim as much as they'd like. They'd still be able to drown and sink to the bottom of the screen, but it only occurs if they run out of air while over 100% damage.
Furthermore, I'm not sure who it is in charge of choosing music to be in Smash, but the selections they've made for Smash 4 are ABSOLUTELY HORRIBLE. They don't pick any good battle music from any of the games, or remix them in interesting ways, instead they put in atrocious music copy/pasted from the source game without any consideration as to how it functions in a battle context.
One of the Pikmin stages, for example, has relaxing nature sounds as one of the music tracks. And of course I'm sure we're all dead tired of hearing the exact same grating, acoustic guitar/whistling melody tracks from Smashville and Town & City. THESE ARE NOT TRACKS THAT FUNCTION IN A BATTLE SETTING. They are tracks to put your baby to sleep.
If you really feel that having battle-remixed tracks or high-energy, fast-paced original tracks from the game would not pay homage to the games that the stages are from, maybe it's time to consider not having those games be Smash stages in the first place. Animal Crossing is not a combat-heavy game by any means whatsoever, it makes no sense why it has any stages in a fighting game at all, much less one of the most competitive battle stages in the game. Its stage layout should be given to another franchise with more action.
Smash needs pumping, energetic music filling every single one of its stages. Not sleepytime relaxing forest sounds for baby to fall asleep to.