As an example of a case that would not benefit from tick dependency, the reticule itself does not need to be tick-dependent on the aiming actor, even though it needs the aiming actor to have finished ticking before it can do its own tick. The reason that tick dependency is unnecessary is that the reticule is in post-physics while the aiming actor is in pre-physics. Because they're in different tick groups, we can be assured that they will always run in the order of the groups themselves, since each tick group completes ticking all of its actors and components before the next tick group can begin.