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In the olden days...
I don't wear my parts so much in general. I don't do extraordinary mileage, compared to most people here, and mileage is split between my too many bikes... I love external bearing BBs and think they are great, doesn't make me renounce using old cup style ones on some bikes, without any problem. Some bikes want to use/show the most advanced available technology, current projects show real nice examples here, my bike is another story.
In the olden days, brake wear would destroy rims.
Again I don't disagree. I thought about disc. I had long conversations with MultiGrooves and Charco, advising me to opt for disc.
There's also cons for disc, which shouldn't be denied.
Most importantly, I really like cantis. And I don't remember it being such a massive pain when I was mountain biking (in my little local and amicable club in Normandy, or as a student in the volcanos of Puy De Dome) to replace a cracked rim once in a while.
In the olden days, spokes would break pretty frequently. Modern stainless steels have basically eliminated that.
In the olden days, hub bearing cups would wear out. Cartridge bearings have basically made hubs last a lifetime.
In the olden days, brake wear would destroy rims. If only somebody would come up with a solution to that, we could have wheels which would last almost forever.