Cement walls have a high thermal mass. IOW they store a lot of heat. So a cement house would maintain a much steadier temperature inside during hot days and cold nights. That's good. In fact I've very much noticed this effect when living in old houses with plaster-and-lath walls vs drywall.
But it would be better if outside walls of these cement houses had a layer of insulation on the outside or in the middle. I am also very concerned about there not being any metal or nylon reinforcement in these walls, especially if they build them in earthquake country. And now almost everywhere is subject to occasional small earthquakes.