Both SR and Sense Vitals need you to have two feats if you hope to hit anything. Also both are very vulnerable to enemy concealment, high AC or mirror image. Also fire resistance.
In the early game where feats are rare, Stone Call requires no feats and outperforms Boneshaker. Later in the game, you should definitely have those two feats because they apply to important spells like Enervate and Energy Drain. But let's assume you don't for whatever reason. Wild Hunt Scouts have 37 Touch AC on
Unfair Difficulty. My buffs put my necromancer at +38 To Hit without even counting enemy debuffs, which means a -4 from not having Precise Shot is still hitting 90% of the time.
Also, and Unholy Resistance is much more common than Fire Resistance in Kingmaker.