I’m guessing at the following answers so don’t take them for fact or that I know of some upcoming software update – because I don’t!
“How is it that the interlink can share the axillary add on modules but the Ethernet cable can't?”
It is my understanding that this has to do with the communications protocol (if that is the right word) that the “smart accessories”, like the WeatherSense, is using versus the GPS Receiver. I am guessing that this will be changed in future software and accessories like the Ethernet hub.
“why automatically disable the interlink connection when an Ethernet connection is established instead of being able to have both”
I understand that this was necessary as most units could not run the sonar, GPS, Ethernet and InterLink all at the same time.
“Lastly, why not automatically disable the Ethernet network when the Ethernet connection is broken instead of having to reset to defaults?”
I don’t know about this.
“Anyone heard if this will be addressed in a future software update?”
I have not.