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I run both mechanical discs and full hydro on different bikes... I gotta say, full hydro is way better. It's cheaper for equivalent stopping power, the cables are more bendy and whilst you can't fix it on the road (or trail), the likelihood of anything actually going wrong is much lower. Plus there's less ongoing maintenance. I think mechanical discs only make sense when you want to take an old groupset and put it on a disc frame.
Yeah but compression-less housing is even more rigid than hydraulic lines!