Your point about objectification of women's body is very true and referrers to the medical sciences' approach towards women's health. The observation is important considering that very few times, social constructs such as patriarchy and caste are analysed for their effects on women's health.
Yet on the other hand, one of the important reasons for continued and constant focus on reproductive health is the fact that reproductive experiences occupy a significant space of overall life experiences of women. If one asks any women about the health issues she will most probably cite a reproductive problem (and most often the root cause of the problem would lie in under nutrition and poverty). Incidentally the very social constructs that objectifies women's body and eliminate her other experiences than those specifically pertaining to having woman's body also exclude her reproductive health issues and experiences from receiving recognition as serious health problems of our society. In my view, both these forces operate simultaneously.
Moreover a developing country like India cannot afford to forget that women still continue to die in a perfectly normal process like giving birth due to sheer negligence and apathy of the society towards women's health. We have a MMR of 407!!!