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I know a few Cannondales where the hose is routed under the unsleeved BB30 axle and held away from it with a tiny ziptie that breaks and then the hose rubs through the axle ruining the cranks until the hose bursts and pisses fluid everywhere. They've both been SRAM though so only nice healthy DOT fluid.
srsly though, I have an externally routed MTB hydro and internally routed road hydro, never had to touch either other than bleeding, what can go wrong? unless sram.