Why not adding "seasons" in LoL ?

I've seen multiple old gameplays on a winter-like rift and i think it could be cool if there were these kinds of things in LoL, like some color changes, some snow, fallen leaves, musics,... to give the impression to the player that he's re-discovering the game,... (i think it could be great and not hard to do) So i ask you this question : Why Not ?
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