>>149428553It's because the Batoffice is too greedy, the internal culture there is notoriously fucked with an arcane kind of tangled cult logic around Batman himself and his associated characters that is notoriously selectively contradictory and deranged.
Letting any of them leave Gotham or letting them have stable arcs risks a repeat of when Nightwing was nearly spun off to his own office, costing them control of some of their toys and running the risk of making Bruce "look bad" or "old".
Jason in particular is a whipping boy because the natural progression of his arc involves either killing the Joker, which is never going to happen, or him accepting that Bruce can't do what he wants because Bruce is legitimately insane and can't afford to cross that line and he needs to respect and understand that it doesn't mean he didn't love him as a son or care, and Bruce admitting that his way isn't the only or always best way to do things and that others do lack his psychological flaws that make it so he wouldn't be able to stop, and reconcile and respect eachother fully again rather than this kind of awkward ignoring of the issue.
But that will never happen either because it's Bruce's mental problems being played as a legitimate flaw instead of another way he's badass or as a reason for him to brood and implies he's less than perfect in a way that actually impacts his effectiveness as Batman that can't be plastered over. Ergo endless BatSchizo episodes where the writers and editors, through Bruce, wig the fuck out and the universe bends as much as it needs to for whatever insane, often hypocritical bullshit that occurs to leave Batman in the right and destroy the problem's validity from a narrative standpoint.
Azrael got hit with one back in the day too where objectively the worst thing he did was strangle Tim, the guy that basically everyone on the Batfamily has brutalized at some point outside of some of the queers and the black ones.