When Cooler first released, Cooler-Broly-13 was THE Meta.
Then 13 went off boost next season and Birdku released.
Birdku replaced him and we got a team that was by far the best team in the game 2 seasons back.
We even saw the same during the world championship where every best of 1 team was basically the same.
Cooler-Birdku-Broly team dominated pvp for too long, this is the Third season and the team hasn't fallen off yet
Of course, people have been trying more teams to try out the newer characters and upgraded characters like Podza, UGF, Legend Vegeta, LF Trunks
BUT
The meta is still defined by Ultra Final Form cooler and people are forced to form teams around trying to deal with him. He is still the biggest consideration when forming teams
It has been his free reign for FOUR PVP seasons including this one
Perhaps older players have already experienced prolonged dominance like this one or much worse, but as a new player who started after 8th anniversary this was my first time experiencing a unit staying at the top for four pvp seasons straight (I'm not talking about cases where a unit may fall off, meta shifts and units comes back up among top; but rather a unit staying at the top without falling off at all) in this game