It also requires a lot of careful thought, observation, and planning if you want to get a flat wall that will be easy to tape, mud, and paint, and will look goo

It also requires a lot of careful thought, observation, and planning if you want to get a flat wall that will be easy to tape, mud, and paint, and will look good when it's complete. Like all skills, there's a big gap between "easy enough for an amateur to do an amateur job" and "results worth paying an experienced professional to do a professional job." Until we have real general AI, robots will not be capable of the latter outside of tightly constrained situations, like assembly lines.