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QUOTE: A CAN bus car is one whose ECM (Engine Control Module) polls various sensors repeatedly to determine the state of things
This answer doesn't really explain what a CAN system is at all. How does this represent a CAN bus? Before CAN, lets say, there was, to simplify, a engine temp sensor. The engine control module "continually" polled the engine temp sensor, which to me would be better than "repeatedly". The CAN SHARES information on a common line between control units, this is very different than you are trying to describe. Hate to be argumentative but in this case I guess I am doing a good job of doing just that, sorry.
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