Stone or concrete walls are normal in many countries.

You can indeed use a hammer drill to drill holes. You can buy them for as little as 30 dollars these days. And you can use an angle grinder to make cutouts for cables/tubes, and apply plaster afterwards.

Many houses in the colder regions already have cavity walls with insulation in between the walls regardless of the building method, so I don't think this method is very wasteful in amount of material.

However, I agree that 3D printing houses had various downsides, such as the weird surface, inflexibility to modify/expand/repair after the initial build and potentiality worse insulation characteristics. I am more of a believer in prefabricated houses, where building houses becomes an industry instead of a project.