Why does riot keep making new champs

Like there is no logical sense at all, why are they making new champs??? there just making it harder to balance the damn game. everyone has to have a dash, have a stun, have a slow, have a getaway, there is 0 uniqueness anymore, just plane annoying and stupid, there should be 100 less champs in the game if they were doing things right. Its exactly like the lorax "its just one champ! How ba-a-a-ad can I be? im just doin what comes naturally" like slow the hell down, we already have 200 champs, we dont need more to "mix the game up once in a while" thats what gamemodes are for, reworks, cool new items. Adding a new champ has waaaay too many variables that just fucks the entire game. and we already know you cant even balance old champs, why can tahm kench litterely win lane against anyone?? its shitty balance like this that pisses me off when they ADD MORE SHIT TO BALANCE! [zombie-brand-facepalm]