Berath doesn’t really control death, though. If we’re to continue using Faerunian comparisons, he’s more like Jergal: a glorified accountant who just wants things to proceed according to the schedule and without unneccessary disruptions. The fact that his job involves the dead is rather irrelevant, and out of all the Eoran gods he’s probably the one with the weakest claim to his domain - after all, the Wheel is a separate natural phenomenon. It’s not like he can decide to keep it from turning or anything.
Uh... Wheel aside, Berath has a very strong claim to his domain as usher/arbiter of souls.