Cost of construction - Less expensive?

I have been living in Australia and observing the constructions here. I am wondering what are the advantages and disadvantages in adopting this model in India. Usually the built up area would start from 2000 sq ft and goes until 3000 sq ft.

Here usually residential houses are single level. No RCC roof, no pillars and no beams. They do foundation and some steel is used in this. Structure is built using wooden framing. On this wooden frame they fix the roof with cement/clay tiles.

There is one layer of brick around the outer wall. Inner walls are made by attaching gypsum sheet to both sides of wooden frames. So, separating walls are made of wooden frame and gypsum sheets. 

Steal, cement, sand used to a very minimum. Wood is used extensively. Dead weight is very low as there is no RCC roof and beams.

Why can't we use this model in India? Would this be cheaper as use of steal, cement and sand is very low and also very low labour intensive. Interiors look really amazing.

Please comment.