Rim brakes have always worked just fine for me over the last 20 years or so that I've been biking seriously. That said, disc brakes instill more confidence on steep descents. For me, this psychological benefit of discs outweighs their objectively better stopping performance difference.

Beyond braking, however, disc configurations provide other benefits like not worrying about your carbon rims delaminating (if using rim-brake carbon wheels), and having wider tire clearance (this is incidental to how frame designs have evolved and not due to disc brakes per se).

My biggest apprehension towards discs is that they tend to be heavier (as a system: rotors, calipers, fluid, wheels, etc.) but I must admit that modern disc setups of today don't suffer as much of a weight penalty as they did just a few years ago. As such weight would not be a deciding factor for me now.

Thinking about this the other way, what advantages do rim brake bike provide over discs? Cost, weight, and simplicity/purism come to mind.