Even if you're not going to be making any potions, the Medicinal Use passive (When using potions, resulting effects last 30% longer.) is just too good to pass up.
Especially with our Amphibious passive (Increases swimming speed by 50% and the effectiveness of potions by 15%.), and if you're a Nightblade the Catalyst passive (Increases potion effectiveness by 20%.) is gonna make us incredibly powerful.