Rework Speed

This game is ten years old (which, yay, awesome for it!) but there's one issue which I feel has become more glaring as time has passed by, and thats the speed which riot reworks champions. I understand it takes time because it interacts with over a hundred other champions, items, etc. But they pumped out three entirely new champions in about two months, why cant we get that for reworks? And why aren't we getting any significant reworks till 2021??! It just feels like riot should take a step back and actually rework some champions instead of pushing out so many. As the game gets older, champions like Twisted Fate, Xin, Master YI and many others feel so horrible to go against. Either the champion gets countered entirely all game, or they just become a two button champion that kills everything. I appreciate Riot for sticking with us these past ten years, but there's no way a kit should stay the same from season 1 to season 10. That just seems ridiculous.