11 speed cassettes are not necessary. paddle shifters and electronic shifting are not necessary. Clipless pedals are not necessary. Carbon fiber bikes are not necessary. Light weight is not necessary. Aero is not necessary. Etc.
This kind of guff is spouted all the time by industry sock-puppets.
Uh huh, so how did we ever survive without all that stuff?
Sounds like you just invested in a disk brake bike, and want to drink the kool-aid. There is NO improvement with hydraulic disk over rim brakes in dry weather. Improvements in technology are great but they aren't for everyone, but forcing changes through onto people who don't want them or need them is unethical.
And you sound like someone not giving something a chance because you want to protect your investments in old tech. It's all about you.
I've wanted disc brakes long before they ever came out on road bikes, no "kool-aid" needed as I based my decision on personal experience. And you are absolutely wrong, they are definitely better, even in the dry. If you don't want to believe that, then it is your problem. If you don't want disc brakes, don't buy one, but hypocritical to tell others that they don't need disc brakes because you sure as hell don't need a weight weenie, aero bike, or any of the other modern tech I am sure you've bought either.
Improvements in technology are great but they aren't for everyone, but forcing changes through onto people who don't want them or need them is unethical.
Then don't buy a new car, computer, phone, TV, camera, etc. because those companies are unethically forcing new technologies on you too. Bastards!
Time is lost on the ascents, much more than descents.
I've made up the time I've lost climbing on the descents many a time, maybe you should stop speaking in absolutes.
And not everything in cycling is about time or racing, I live near a big technical descent, I regularly get stuck behind slow moving cars and have to ride the brakes down, discs are a big improvement in this arena too.
And like buying a nice groupset, wheels, frame, etc, the feel and feedback of disc brakes is a big improvement, now you may not appreciate that, but I do. Everyone I know who has made the switch to disc has raved about them.