Canbus or multiplexing has been used on cars for sometime but has still not been universally accepted. I wonder why not. In theory the system sounds great but I would be cautious.
Unreliability in electrics is usually caused by connectors. In theory, using a CANBus means less wires, hence less connectors, hence better reliability.
Offset this against the specialist equipment needed to debug these things in the unlikely event that they do go wrong, and take your choice.
Me, I'd be quite happy with it. (My car has one). Suspect the only reason that it isn't in more boats, is that many boats are 10 years behind technology-wise.
You're right, not universally accepted, because most car companies with reasonable engineering budgets have implemented them, and give you warnings when bulbs have failed etc.
Others with smaller engineering budgets, but bigger marketing budgets, attempt to persuade you that you don't need one, you should be cautious of this new-fangled technology, you need cupholders and styling instead, and what's so bad about only getting three points for that blown bulb anyway ?
Canbus is fine unless you need to add any non standard(non approved by manufacturer) stuff which needs to aquire data from the system to function.Many new cars Mercs/volks/Jag and even the jolly old Transit now use this system.We have have experienced a few probs but only when we have attempted to add non standard extra equipment.