Find primal all the time. I stopped counting. Got a Dayntee and trag head primal (im using inarius) for my Necro . Everything else in the Forge. Usually in 4 man group, fast finish on regular and Greater rifts like 4 min.
When you do find primal, you have to leave and find new 4man party. I've played for 4 hours, same party, find 1 primal.
But find new game after 3 or 4 runs and keep switching between GR and regular. Primals so often i don't even know I have them till my inventory is full. a whole bunch of useless, non set, non specific garbage primals I cannot use. I almost rather not find anything. Get super excited when you see the red border, same time disappointed when it's no where near what I can use. My heart cant take it.