After all, there’s always the chance that Law & Order: SVU and/or Organized Crime will face cancellation news later this year, so it’s definitely smarter to bring Benson and Stabler together as many times as possible while the iron is available for striking.
Law & Order: SVU’s powers that be are extremely aware of the advantage they have with Christopher Meloni back in the saddle as Elliot Stabler, both from a storytelling perspective and from a fan-attracting perspective.
(Not that cancellation news is likely, especially with rumors about another spinoff being in development, but still.)
As such, it only makes sense to keep the crossover elements alive while they’re able to happen.