Right now DPS priests have a really weird selection of runes that don’t really function. It’s rough to have the two best dps runes share the same slot, and have the other slots not have much of anything for PVE group content.
SW:Death is really only useful for PVP and open world content. It’s always been an ability that has never made a great impression in PVE content.
Let us be able to take both Void Plague and Twisted Faith together. You would see priest dps go up, more priests would want to spec for mind flay for damage, it would make penance compete with dps options and not just be the defacto best option too, and you could get priests into a different role to allow for more balancing options to healers if needed.