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popey makes a good point. Take it out of context - ever been in a race car? For anything but racing (on THAT track in THOSE conditions)... they really suck. Do I want race-driven and funded R&D on my bikes (and cars and running shoes) *$#& yeah I do. But that doesn't mean every bit of tech is ready for my needs - cost vs performance, etc.
Full disclosure... I have a few bikes with rim brakes and a couple with disc. I like the disc brakes a lot. They really are just better - for me... on my routes in my conditions ;-)