i hate messy cable routing (and don’t even get me started on how long some bikes have their front brake hose)
rear brake hose = from lever into guides on left hand side of frame.
rear mech cable = from shifter to centre guides without going round the stem/headtube
front mech cable = from shifter round head tube to guides on right hand side of frame.
run it that way on both mountain bikes with top tube routing (old clockwork =above the tube guides, sanderson life, below the tube guides)
on the scott which has routing on/under the down tube i run
rear brake hose = from lever into guides on left hand side of frame.
rear mech cable = from shifter round head tube to guide on left crossing to guide on right at bottom of down tube
front mech cable = from shifter round head tube to guide on right crossing to left hand side of frame at bottom of down tube.
work fine look neat