I was trained in a wire-thru province, and moved to a pigtail province. Needless to say I was the fastest splicer in the province for about 3 hours
I share the view of the extinction of the electrician to the assembler... with all this quick-connect technology.
A prefab world needs very little but a rubber mallet... and a machine-u-facturer.
In my training with wire-thru, I learned very quickly that making a circuit with my hand, with a load downstream, is like gettin bit by an electric cat!. So I took my time to trace the circuit and shut it off most of the time (CEC 2-304 Disconnecting). Especially with a possible 9 wires going to one plug.
My experience with wire-thru has left me almost fearless of live pig-tail circuits. Feels like a 9v battery on my tongue. And with these weird plastic boxes, shorts are a rarity, almost refreshing.
In some ways I like pigtailing better, but I know that the more stricter the rules get (safety/security), the more technology becomes quick-connect, the less respect the next generation of electricians will have for that animal we call electricity, as we push it further away into products.