I did a lot of remodeling and wiring in my house. I had to change a lot
of existing circuits. I often used switched box, either metal or
plastic with cover. Many times the switch box is inaccessible when I
don't have way to connect two wires in assessable box. Inspector never
told me anything about inaccessible boxes and I don't understand why
they cannot be used. Otherwise I had to rip off entire house to get to
the accessible box where one piece of wire starts.