We have a clustered normal servers and started 2 new primitive plus servers on ps4, for what it's worth I would add the primitive engrams to the main game.
For pve players it gives so much more content with the extended farming, cooking and building items, the arguement that in the main game it would be ignored is a mute point in my opinion, just because you have tek troughs and things doesn't mean you wouldn't have a smoke house or fruit press and the like as they look great and give you other things to harvest and farm.