I'm curious if there is some productivity-improving tech for electricians waiting to be invented. The following will be super North-America-centric, but:
Right now you have to fasten a box to the wall structure, cut the wire so that about 8" can make its way into the box, strip the outer insulation and insert it into the box, strip at least some of the individual conductors, and then splice (by twisting and using wire nuts, or less commonly using a press-fit dingus) the ones that need to be spliced.
You then repeat that for every outlet (which in electrician-speak includes lamps and such) on the circuit. Then repeat that for every circuit. You are now ready for your "rough" electrical inspection (the one before the in-wall wiring is covered).
Then before the final inspection you have to individually connect each conductor to (usually) a screw on the actual device before cramming^H^H^H^H^H^H carefully folding the wire back into the box and screwing the device in place, followed by screwing the cover in place.
Repeat for every outlet in the unit and you are ready for your final inspection.
What I'm picturing is a special box that can insulation-displacement-crimp right onto the wire (probably with some giant pliers. On the inside it has some sockets that the eventual device plugs straight into, possibly with a sort of optional middleware layer that can reconfigure the connections for less common hookups.
So you crimp all the boxes to the wire and fasten them to the wall structure and you're ready for the rough inspection.
Then after the walls are covered you plug in the devices directly for all of the common configurations (e.g. just a receptacle in a string of receptacles) and fiddle with some kind of middle layer for the oddball configurations (e.g. a duplex receptacle where one of them is switched).
As an alternative to the "middleware" maybe there are a collection of different boxes that are pre-configured for the circuit arrangement in question (not unlike plumbing components are today).