Originally Posted by Biker395

For me it's because it would be incompatible with all of my other bikes.

I tried mechanical discs when they first came out, and they were definitely a PITA to deal with. Hard to adjust, the pads wore quickly, were hard to replace, and weren't interchangeable. I had a rack on the back of the bike (an MTB) and had to get a special rack to clear the rear caliper. Discs are already a greater PITA to reinstall the rear wheel, but with the added difficulty of that rack (the rear attachment point was the axle, so you had to align the wheel, the disc in the caliper, and the rack in the dropouts at the same time), it was much worse.

For all those reasons, I was not impressed, and I wished I had just gone with v-brakes.

I'm not against trying them again, perhaps even hydraulics ... but I'm not aching to do so.