If the world existed only as a suitably advanced hallucination, would your experiences would not be different. A hallucination which at this moment is remembered to have had followed certain rules is under no obligation to continue to follow those rules.
Reality is only a useful model within the model of reality; outside of the model of reality, having models is in general not useful.
What makes the model of reality ‘useful’, as opposed to any of the models which are mutually exclusive with reality?
Huh?
If the world existed only as a suitably advanced hallucination, would your experiences would not be different. A hallucination which at this moment is remembered to have had followed certain rules is under no obligation to continue to follow those rules.