That is true.
One of my classmate did send her girl to my mother school. But she's considering IS for her girl now, who is at lower primary. She is surviving well academically but the mummy feel something isn't right.
The reason for not considering government / subsidized schools mainly depends on where you live. If one lives in net 41 / 11 / 12, then one may feel more secure to choose government / subsidized schools.