Running a dedicated ground to each device can prevent some esoteric problems like ground loops, but that's normally not a concern on a small boat. Lots of extra wires, extra costs, extra weight, all NEEDLESS, really.
You might consider a compromise if you are worried about efficiency an reliability
. Run a separate ground wire for each subsystem, i.e. one to a common point for the instruments (which are usually near each other), one to the helm
, on up each side of the boat for the port/starboard cabin
lights, perhaps on for the mast
Failure of the ground bus isn't, or should be, a major concern if your wiring
is at all competent. Striping the wires, also not a concern if you are using an automatic wire stripper, which can spread back the insulation
without cutting the wire, make a splice and cover much neater and stronger and quicker afterwards. Or a vampire tap of any kind. A hot wax glue gun can be used to secure those splices to the hull
, so they are protected from movement and chafe as well.
If you want to run duplex all over...bear in mind, you won't be able to use ABYC color coding, or any other kind, for your wiring
. Duplex will invariably be red and black, or red and yellow, and all look the same. Either way, generous use of a Brother P-Touch can help you keep them sorted out for future reference.