Yeh id agree not an easy thing to really be 100% accurate about.
My overal case temp went down by 5c on average after cable tyding, so every new build i do now, its just part of the build really to try and make it neat/semi neat inside.
Cable management seems to be very popular with air cooled cases. Since moving to water I'm mostly ignoring it:
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The problem is to sort out the cables & tubes I have to rebuild it in a pretty specific order, and will then be unable to remove the motherboard without stripping the watercooling apart. The space beyond the 120mm radiators is fairly clear, likewise below the 240, so I would see no improvement in temperatures.
It's hard to justify making it so much more difficult to work on for no improvement in temps. I'll have some quick disconnects fairly soon so may rebuild it when they get here.