There are a lot of code issues you can run into when actually installing and repairing wiring that your average EE wouldn’t know much about at all. And just because you can design the power system for a building doesn’t mean you have any how to fish romex through a wall.

That’s like saying a mechanical engineer should necessarily be able to work as a machinist. Some of them can for sure, but it’s not something they are required to learn.

Also in many places anyone can do electrical work on their own house.