I think that has less to do with the wiring itself and more to do with the amount of things that need to be wired at this point. What protocol and phy is used f

I think that has less to do with the wiring itself and more to do with the amount of things that need to be wired at this point. What protocol and phy is used for connectivity won't change this. At least maybe wireless can be PTP and not deal with the issue CAN has when one of the links in the chain goes offline.