As you said though, none of the good things that came out of Barbara getting paralyzed are actually from The Killing Joke. I'm fairly certain Alan Moore wasn't thinking to himself "Man, this will be a great springboard for some inspiring character arcs for Barbara in the future". He wanted something uncomfortable and shocking, which it was, but even he thinks it could have been done better.I still find it kinda funny how people see The Killing Joke as some big problematic thing. It's major in that it's one of the only times that the status quo is changed and sticks and doesn't try to return to normal. Admittedly where it goes from the events is likely far better than the events themselves but it shows the idea of people still finding a way to carry on, that life doesn't just end after such an injury and doesn't have to. Hell Arkham Knight (the video game) actually does some pretty good stuff with a subplot with Oracle which pays off at the end when you get the true ending of the game.