It actually was happening in early 2019 (yay, I get to link my thread again) before the devs gutted balance in the name of OWL. GOATS was already thoroughly dead on ladder but the live game was destroyed as DPS were buffed and Tanks were dumpstered.
Then Sigma was released and 2-2-2 happened - both at the same time. Since then has basically just been scaling back the 2019 powercreep and nerfing the obviously-broken heroes that were introduced at the time.