Understood. My point is that the manufacturers aren't offering these things as options, factory guaranteed.
Many of them do offer the options you mention plus more. All of which come with limited warranties. Not sure which boat brands you are thinking about.
Also, there are a myriad of varieties of nav instruments, A/C, inverters, gen sets, etc...
I suspect many prospective purchasers of boats large enough to accommodate these toys also are far more sophisticated and knowledgeable than bus buyers about specifics to accept any boat manufacturer's choices to install 'builder grade' accessories.
Also, boat commissioning is much different requiring far greater expertise in installation critical to both ease of maintenance and function, e.g., most buses don't come equipped with wind, speed, depth, radar, gps, ais, etc... all of which must be integrated.
Comparing purchase of a bus and boat (we have both) is 'apples and oranges'