I think this another good example of the two different worlds of architecture and engineering.
In engineering design, it is understood that a drawing is nothing more than a set of instructions to one or more tradesmen that explains what is to be made and strongly implies that the designer/draughtsman knows how it is to be made.
Training for engineers isn't about form or balance or perspective - it's about how to make things, the strengths and weaknesses of different materials and processes and the relative costs and life expectancies of parts made by different processes.
So, "trade skills" are those of turners, millers, borers. welders and press operators not how to use a piece of software - that comes on top.
Still, in one way I envy those of you entering the age of BIM, it must be exciting finding new things to do and new ways to do them.