ARAM is too random for a ranked game mode, but TFT isnt
number of random elements, or things you cant control in TFT: champ rolls your opponents each round your items whether or not you even get items what your characters do your starting position on the carousel the actual carousel the items of the champs on the carousel
number of random elements in aram: your champ
why riot thinks everyone plays aram: "because its random"
why lots of people actually play aram: "because riot ruined rift 5 years ago, and theres literally no other permanent game mode"