In 1993 I visited one of these forts: Amber Fort. It was my first trip to India, and I was completely overwhelmed by its street life and visible poverty. Jaipur, the nearest city to Amber Fort, also was the first place we visited on our tour.
The Fort is located on the top of a hill, and we walked there in the late afternoon. I remember that it was getting dark when we returned and that there were lots of local kids yelling at us, walking with us, or wanting to hold hands.
The fort was built from 1592 and "shows the evolution from the purely defensive fort settlements of the early medieval period to the palace fortress type of architecture typified in the 16th century." It is quite an extensive complex, with several courtyards, gardens, a temple, audience halls and living quarters.
My visit was so long ago that I cannot really argue if this is a viable WHS or not. But certainly "palaces" in general are still a very prominent feature of Indian history and culture.