Krillin is the most "human" of the Z-Fighters. An interdimensional wish might be the only way to save a dying Krillin from a threat that exists outside of time. If Krillin is erased from history by a Demon Realm invader (hinted in Daima), Android 18 would logically use an interdimensional wish to pull a "spare" Krillin from a dimension where he never died against Tambourine. This creates dark, dramatic tension: Is the new Krillin her husband?
As of this writing, the "Interdimensional Wish Android 18 U UPD" is not official canon. It exists in a grey space: dragon ball interdimentional wish android 18 u upd
Androids 17 and 18 were originally humans (Lapis and Lazuli) forcibly converted into infinite-energy cyborgs by Dr. Gero. A popular fan theory suggests that their mechanical components are connected to a localized spacetime pocket—explaining how they generate unlimited ki without training. Krillin is the most "human" of the Z-Fighters
An interdimensional wish could "hack" that pocket. Instead of infinite stamina, imagine Android 18 gaining "infinite access"—the ability to step between dimensions at will, much like the Xenoverse Time Patrollers, but without a Time Ring. As of this writing, the "Interdimensional Wish Android