It would make the game unfair and it wouldn't feel like it belongs to CubeCraft skywars as CubeCraft skywars aims to be as vanilla as possible. Like you don't just mine ores to get end game items and you don't just have random power up kits that has you some sort of magik power ups that basically gives you advantages over other players. Personally I think it should not be in normal skywars. However, in skywars chaos, it does fit because well, as the name suggest, it's chaos. It's supposed to be chaotic, unfair and unbalanced and that what makes skywars chaos the skywars chaos we know and love.
I mean just look at how simple skywars is on CubeCraft. It's not complicated and it's just basic skywars. Adding these kits would ruin the whole entirety of CubeCraft's vanilla skywars.