As far as I’m aware(having done some work in the foundations of quantum mechanics/concrete models of branching in chaotic systems) nobody knows, there isn’t really a well-developed theory of what the ‘branch production rate’ of arbitrary physical systems is. Based on what we do know—broadly speaking, creating more chaotic systems with sensitive dependence on initial conditions seems likely to create more branches. That said, even if we had a satisfying theory, I don’t think that creating more branches in more desirable worlds makes sense, since those branches would each have a correspondingly smaller probability, reducing their moral value(see comments here for arguments as to why that’s the correct way of assigning moral value)
As far as I’m aware(having done some work in the foundations of quantum mechanics/concrete models of branching in chaotic systems) nobody knows, there isn’t really a well-developed theory of what the ‘branch production rate’ of arbitrary physical systems is. Based on what we do know—broadly speaking, creating more chaotic systems with sensitive dependence on initial conditions seems likely to create more branches. That said, even if we had a satisfying theory, I don’t think that creating more branches in more desirable worlds makes sense, since those branches would each have a correspondingly smaller probability, reducing their moral value(see comments here for arguments as to why that’s the correct way of assigning moral value)