It seems like the single change (aside from aspects of how magic works) is that Voldemort is more competent, which forces his enemies to level up and go to more extreme measures. Looking at every prophecy is one of those extreme responses, which then triggered a bunch of other changes relative to canon.
It seems like the single change (aside from aspects of how magic works) is that Voldemort is more competent, which forces his enemies to level up and go to more extreme measures. Looking at every prophecy is one of those extreme responses, which then triggered a bunch of other changes relative to canon.