Why don't you like mana? (Pitch at resourceless champions)

Why do they exist again? Is it because of lore? Is it because of 'originality'? Is it because Mana per level is too frustrating to put into balancing perspective? Is it that itemization must be unique and to prevent overpowered usage like sheen of champions like shen who can spam flying magical purple daggers? Is it because everyday we run out of a unique passive idea after every champion release? Is it because some champions are meant to stay in lane in comparison to others? Is it because it makes no sense for them to have mana? Because if it is then that reasoning is probably the worst of them all because everything is nonsense when mana is included.

Is it because we don't want to force all champions to have to buy items for mana problems? Is it because the cool kids just don't like drinking blue sodas? Is it because colorblind players can't see the blue properly? Does that even make sense to me damn it. Is it because Red fish Blue fish One Fish and only two fish? Is it because mana is where the wild things roam? Is it because...shit I'm running out of ideas. Is it uh, is it because um. Vayne should be removed from the game.