I get why your upset but I watch YJ for the team and last season really borked that up with people like Tim getying no screen Tim. Theres already 2 bats there and a big mystery going on. Do we really need Jason now??
I think they could fit him in though. Like there would be a brief history scene showing it’s a post Under the Red Hood. Batman and Jason aren’t speaking to each other. Present day, Jason gets mixed up with the main villain one way or another (I’m hoping he’s acting sorta like the bad guy). Tim has to explain to his team who this said bad guy is and how to stop him from helping the villain. But towards the end of the season, Jason shows his heroic side. Or something along those lines.