I never understood the problem regarding causality and the light cone. Why a latency between photons and the FTL event break causality? Isn’t just a visual delay and the events aren’t still kind of “stacked”? Even if we alter photons we just break the visual ordering, the actions still happened in order.
The quantum world constantly needs to agree on what the state of the macroscopic world is, there is a limit to the speed of that agreement happening, hence the speed limit on the spread of information (speed of light). There are contradictions happening constantly in the quantum world, but they are resolved either way.
Any contradiction would be resolved on quantum level even if it can be interpreted at macroscopic scale as breaking of causality.
The important thing for physics would be to better clarify what time is. Why is the speed of light as much as it is, why is there time dilation related to mass and why is the time slowing down for objects travelling faster.
My guess is that the quantum world needs more of its own time to agree when there are more objects (more mass) close to one another, or that a fast travelling object needs to "agree" with its surrounding more frequently, and that overhead is manifesting as slowing of its time.
