City Lights already does this. (however builders are still here)
I don't mind micro.
We already have automatic roads thanks to traders, however I would also let builders do them, (easily to mod, but I would like to see it in vanilla) roads were important since the dawn of time, and military engineers cost too much to use them that way.
Build charges were rather successful transition from immortal workers, I was skeptical at first, but from gameplay perspective - the additional careful planning of using every single one of them, specially in early game, well, I like it.
I wouldn't mind adding auto repair. Also, being able to queue in production prerequisites would be awesome.