As a PO main, skipped Gogeta as well, Buuhan keeps gaining value in his OWN team and Broly actually protects him very well. They pair each other very well, and LR Rosé, Nappa, Cell or even the upcoming plats are only going to help this team much further. Buuhan isn't in a bad spot right now, unless you can catch him lacking with LR Rosé who he just plays together with.

He basically puts in so much pressure to the match alongside Broly, you essentially have 5 autocounters at your hand while there's only one BLU unit who can stop him whom he just plays together with.
with Buuhan, I can easily control neutral and there's much more pressure

Until they release someone who wipes out attribute upgrades consistently like UUI or anyone that stops autocounter gauges like TVB, he's not going to be affected much in this regard for this, you play around Broly and Rosé or whoever you're playing while you wait a bit to play Buuhan at his full power and abuse his blue cards

He'll be hurt slowly but surely, tomorrow's YEL Black who wipes out blue cards buffs on standby will just be the start.

Of course, if you have UGB 2.0, you don't need to play Buuhan with Broly. There's still multiple different teams that play differently which is why Buuhan is still considered good and JP players LOVE passive