I understand why you need a neutral to complete a 120v circuit.
I just did a complete remodel of my home, 100% new electrical from service to every outlet.
There are several outlets in the kitchen that I have a junction box in the attic that goes from the power source, to the light, and a wire to the switch to interrupt the hot. This was done to reduce the amount of cables installed in a 4 gang box in a wall since there are some 12-AWG romex wires in there.
In this scenario, the black wire is the hot, and the white wire will carry current back to the junction box which ties the lighting circuit’s neutral to the line neutral as well as a switched hot. When this was done, I did not even consider the need for a neutral in the box for a Zwave/ Zigbee dimmer.
There is a common wire in the box that I can tap off of (ie power source for the garbage disposal switch) using a wire nut. Will this work - or does the switch actually read anything from the neutral?
All lights are LEDs. They are all can lights, but I would prefer to not swap the bulbs for halogens.