Check the older magazines from even as far back as the 40's and 50's. On their small layout build articles, most no bigger than 4x8's, MR, RMC, Model Trains, (and probably a few others time has forgot over the years,) always stressed adding more than one set of feeders to the tracks for electrical reliability. I don't think that attitude has changed since then.
Now, I'm not advocating that a modeler with a simple point to point or loop layout, who only runs one loco at a time and no more, needs DCC, I never said that. Its just as soon as the modeler decides he wants to run more than that one loco, or even to run 2 at the same time, the wiring starts down a more complicated route. Even if its just adding a kill switch to a section of track, its still more complicated than the original 2 wires to the track in DC. With DCC it doesn't have to be. That's all I'm saying.
PS. I have to agree with the others, this IS
a very interesting discussion!