wire from an internal switch console ... rather than connect directly to an adjacent CANBUS that already went there
This type of design was not straightforward for me as well, but in the end this is because a car is topologically not an integrated machine with centralized control like a PC, but more like a network rack kitted with various systems, with user interfaces at the front and networking at the back.
We tend to look at a driver's seat of a car and understand it as an equivalent to VT100, and that is not what it is; the controls in a car are for each discrete systems that shares a chassis. Therefore the control goes to respective systems and communications goes through the network.
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This type of design was not straightforward for me as well, but in the end this is because a car is topologically not an integrated machine with centralized control like a PC, but more like a network rack kitted with various systems, with user interfaces at the front and networking at the back.
We tend to look at a driver's seat of a car and understand it as an equivalent to VT100, and that is not what it is; the controls in a car are for each discrete systems that shares a chassis. Therefore the control goes to respective systems and communications goes through the network.