Weapon Variants NEED to come to Fiesta

Fiesta is my favorite new Playlist in Infinite by far. What reason is there for the awesome weapon variants such as the Breacher, Striker and Longshot to not have a home in this Playlist? If people are concerned about balancing issues 343i, just restrict the variants to Fiesta or give them a separate Playlist! They add 33 new ways to play to Infinite and this games core weakness remains customization.