
Not all people work on a min-maxing basis. If arcanist was somehow as effective as the other two classes put together, there's still people who will like Thaumaturge better from a design perspective (nukes) or from an aesthetic level (staffs and huge balls of fire/ice). The same applies to Conjurers.
As far as I understand, Arcanists will be based on DoT and HoT effects. Some people don't like those (design). In some encounters it might be better to have the Conjurer's one-time big heal instead of a heal that works over time. So they wouldn't be making any class less relevant unless all you care are about is how classes compare to each other via DPS or Heal meters.
As far as I understand, Arcanists will be based on DoT and HoT effects. Some people don't like those (design). In some encounters it might be better to have the Conjurer's one-time big heal instead of a heal that works over time. So they wouldn't be making any class less relevant unless all you care are about is how classes compare to each other via DPS or Heal meters.