The issue is with instantaneous. What does that mean in a relativistic context? Depending on the speed of the observer, "instantaneous" changes. This is fine in

The issue is with instantaneous. What does that mean in a relativistic context? Depending on the speed of the observer, "instantaneous" changes. This is fine in reconciling some story in the future, but if there is an action happening instantaneously with something else, then we need a notion of same instant. This is easy to add to have something working, but it is extremely hard to add it in a principled way.