Sorry - I got bored with the youtube (say me with my short posts!).
It reminds me of a multiplex system I used decades ago - a single power loop with takeoffs for different loads (fuel pumps, fans, flashers, brake lights, etc).
In practice a few extra power power lines etc were added for redundancy and security.
Oddly enough, a major consideration was security - ie, resistance to jamming, interference, EMP etc.
Later the control method was a toss up between fibre-optic and twisted pair....
But I still worry when I see such "recent hi-tech" systems link to diode-fkn-isolators for batteries. How primitive is that?
It's almost as primitive the security and having non-user configurable overrides & mods on modern systems (CAN, new HUs, HO alternators, overrides for stability-controls, ABS, auto-wipers & lights...).
All IMHO of course....