Calculating to heat death doesn't make a difference to the people in the simulation. So, it's not the same as terminating the simulation before completion. For

Calculating to heat death doesn't make a difference to the people in the simulation. So, it's not the same as terminating the simulation before completion. For instance, if calculating the simulation was paused for 100 years, then resumed, the people in the simulation would never know. So, just because it might take five seconds to calculate the entire life of the simulation does not mean entities in the simulation would experience it like that. Also, our universe seems pretty stable, so if heat death is a part of our universe's life, then there is a reason.