Quite right, my bad, I conflated DCC and LocoNet. Both are needlessly complicated protocols in my mind for what is needed; they offer simplicity of wiring at the expense of shoehorning a lot of unnecessary baggage into the small mind of a Nano.
DCC - the benefit of using DCC is chiefly in taking advantage of the rail-based comms, avoiding wiring any form of control network. But, DCC doesn’t readily support bidirectional traffic, so…
Loconet - if one already has Digitrax, then Loconet has the advantage of already being present on the layout, particularly if one is using distributed boosters or distributed throttle panels. But often the routing for those needs isn’t optimal for what is needed for turnout control, so the networks grow significantly anyway. If you don’t have Loconet, then why Loconet vs RS485? It will probably depend on other factors, like folding in other Loconet-capable devices.
For me, one or more distributed RS485 networks was the way to go; if I was starting today, I’d seriously look at doing it all via Wifi, but I’d want to build quite an experimental test apparatus before I committed.
As I said, simplicity is in the eye of the beholder.