champs with no resource are non sense and should not exist

Ill explain this why they shouldnt exist Mana / fury / energy is the living power inside the champs and it has limits so what does that mean ? garen kata and riven have no limit to thier living power ? when nasus who is god of death does have ? what are they ? broly ( dbz ) superman ? even superman got tired in fights , no resource means this champs never get tired ? where is the logic in no resource champions ? mana/energy champs , after using loads of abilities they run out of mana or energy , to regain thier mana they need to rest or drink mana potions or buy items or blue buff ( items and pots not for energy )