I don't know why anyone would want to use a 2 pc versus a rod with more pcs, except that a 2 pc rod catches more fish.

A 2 pc rod is easier and faster to assemble and take apart, because it has fewer sections it comes apart accidentally less often during the course of a fishing day, and as a result keeps you fishing longer and with less hastle. Isn't that why we go fishing in the first place?

I remember when 5' fly rods were fashionable 40 or so years ago, and when rubber soled wading shoes were claimed to be equal to felts just a couple years back.

I would think that rod manufacturers will also put their heads back on at some future time, and we'll see a reintroduction of those superior 2 pc fishing machines.