Halo is a simple game why change so much?

Halo all the way threw 3 have been very simple a simple thruster pack could of been good for a new game after halo 3 the rest of halo should stay halo a bit they could of add more guns for beginners that are a little easier but it should never beat the dmr or br unless they miss 1 shot same in midrange if they miss 2 because br or dmr up close is not easy to get 4 shots all the time that would help noobs idk i’m only speaking for myself i could be more specific but i feel like playing halo haha