Biggest advantage of saree is that hindu women can show off and flaunt their bodies remaining (sanskari) within their culture, for some jeans is not sanskari but saree is.
Exposing the back in saree can limit direct eye contact which many hindu women are not comfortable with, some feel shy others don’t like a random guy gazing at them to begin with but still she prefers men noticing her. When men don’t notice her she thinks is there something wrong, is she not looking good today. Women can sense it more than men when someone is looking at them or noticing them. The longer it takes her to wear makeup or to get dressed the stronger is this feeling of not being noticed; human nature if you spend your time and money on something then you would expect certain results.
The lower and deeper the blouse back the better and effective it is.
Even better if the bra is peeking out of the blouse, adds so much spice; instant tadka.
What the exposed blouse back which comes in many different designs does is, it channelizes the energy and focus of the male towards the back portion and minimizes eye contact. The best way to test this would be to send a hindu woman dressed in a saree with deep blouse back to a muslim mohalla or basti, a place where the most manly, dominant, libidinous and sexually powerful species of humans reside. The musalman men would focus on the spot which is the most revealing, it would instantly shine in the musalman man’s eyes, in this case it would be the exposed back of the hindu woman. 90% of the focus and lust of the musalman man would be on that specific part of the body.
The chauvinistic and manly musalman men would start drooling. Their hands would scratch their dicks from outside their pajamas.
But all this would happen behind her back, she would feel proud about her femininity in making these men look where she wants them to look with limited eye contact and in case she is feeling real naughty her pallu would drop automatically which would seem unintentional.