2. Disc brakes aren't good enough yet. This is more controversial, but here are the reasons not to get a bike with disc's. Serviceability - you might not think about it when you buy a bike, but servicing discs is a pain; they are more complicated and more can and does go wrong than with ye old caliper. Most importantly however, disc's negatively affect a frames ride characteristics. Riding disc vs. non-disc versions of a frame back to back, you realise they arent as snappy, they're more sluggish and feel comparatively dead. Whatever they have to do to reinforce the frame detracts from the ride quality. That and they're just heavy. The only benefit to discs is the braking is better... but at the cost of ride quality, serviceability and ultimately money. its a no-brainer to avoid discs IMO.
1) Tell me, what more goes wrong with the caliper? I've never had caliper issues.
2) How do you quantify snappiness? Does it come from a stiffer frame or a flexier frame?
3) You know what detracts from my ride quality? Repeated braking from 45-50mph to 20mph on steep descents with hairpins and carbon braketracks having poor thermal conductivity. The lack of initial bite on even the best textured carbon rim braketracks from ENVE, Mavic, Zipp, Campagnolo. The braketrack wear after 3-4 years and a couple million feet climbed/descended. My brands new Campy H11 rotors have brown discoloration on the tynes from heat. You're putting the same energy into a rim brake system, and if your using CFRP rims, you're relying on that heat not melting/delaminating the composite.
It's a no-brainer to avoid rim brakes imo.