So why Riot dosent nerf/fix toxic champions?

examples

Now if you go and say "well do the X and you will counter the Y man its so easy"

Yeah it dosent work any more...ok back in the days you could shutdown akali in lane by pink wards and oracles or actually shut down her in lane same as nasus and vayne

But now days the game and the meta and the runes and the how the game work and some buffs that were added to them for that specific reason (to scale faster)

Then you have EZ that brake any rune and riot still refuse to nerf his Q already

Ornn that everyone were saying to riot "RIOT DONT ADD MAX HP DAMAGE TO HIS W KEEP IT CURRENT" and riot was like "Nope lets make one more champion toxic and broken"

And eve just have too much damage atm cause of runes...

SO why riot take so LONG to fix and nerf this champions? what the deal here...