So having the exterior walls monolithic and clad with facing bricks would be like wearing a belt and suspenders at the same time... Besides, either the thermal insulation would not be sufficient or the walls would become insanely thick, not to mention the additional costs. Facing brickwork is usually double-layered: load-bearing masonry, in front of it with a gap and connected by wire anchors the facing brick layer, and between them the thermal insulation. This is basically the "standard" where I live.