Think there are a few mores years for commercial/industrial as a Electrical Trainee will be found out very quickly in this environment.
Not just for the containment part as this area is mostly done by mates/teams now but technically. They will have to get a grasp of 3 phase systems, motor circuits, alarms, etc etc.
Rewiring an house is perhaps the most "technically" demanding and perhaps the most expensive installation in a domestic situation where a typical rewire would be 3-4K.
On commercial/industrial a lighting installation alone could be double that and training, knowledge and experience would all come into the pot of design, cost and implementation
I know from my experience in all domestic and mostly all light commercial I would not need to do any deign calcs at all, my training and experience pretty much carries me for this.
But even now in many instances I do have to calc things and unless you have been trained first and then acquired the experience to do these calcs, you could easily either over price and not get awarded the project or worse under price and lose thousands