They`ve been taking Sheila`s importance and character away slowly since the 2011 reboot. That`s pretty much the one thing I dislike about the mythos of the character but it`s been a thing since the animated UTRH wholy skipped it to just a Jason and Joker situation.
The real reason I dislike it is because despite Loedbell writting it well (issue 9) it steals away the strongest reason for Jason to go to Middle East and to his demise being heroic despite whatever issues he dealing with. In contrast, it`s now mostly Jason trying to stop the Joker from dealing with nuclear weapons in a case with Batman or Jason having a fallout with Batman and going after the Joker to prove himself like in The Last Crusade (this one with the in-story assertion that Jason was supposed to take over Bruce in the near future, however).
I think him trying to stop the Joker out of an arms deal because he made the cal is still fine, they`ve just been sketchy with the details.