I always thought it curious that Americans like to build houses that blow away while experiencing lots of hurricanes all the time.

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.

You print 2 layers with an air gap between. Themis gap gives room for plumbing and electrical, and also serves as an insulation layer. A thin layer of still air has relatively low thermal conductivity, minimizing heat exchange between inside and outside.

As to the stone thing: most of the houses and apartments in Germany are mainly stone walls. Somehow we manage it here.

Benefits include: massive soundproofing. Heat and cold envelope. Stability of buildings in tighter blocks. Build once, use forever.

Store is just fine, and yes we have an impact drill. It cost 30 Euro and does all of the light duty stuff we need.

Renovations are tougher, but also rarer.

The people who thought 3D printed houses were innovative had no idea how houses are built.