It's a mistake to withdraw from Finger 4 and other heights, while agreeing to turn everything up to Finger 8 into no-man's land, because up to Finger 8 is legitimately Indian side of LAC and India should be able to build infrastructure right up to Finger 8. The Chinese had no business moving forward of Finger 8 in the first place. Now the Indian side will follow the agreement to the letter, while Chinese will not. Treachery is in Chinese nature. I would not be surprised if the Chinese have already built underground facilities at/around these peaks, and they are simply going underground for the winter, which may appear to look like pulling back.
Instead of pulling back, India should turn all of its currently occupied heights into permanent well-defended bases like Siachen. India can also build underground facilities at/around these peaks for the winters.
There is also a more strategic reason for India to stay and turn the heights into strongholds. The Chinese are waiting until their CCP-controlled puppet becomes the US President before making their move. They will return post January 20, 2021, when their puppet will ensure non-interference by the US when PLA returns to Pangong Tso and other areas. When they return, it would be in India's interest if the heights it has currently occupied have turned into permanent strongholds with permanent roads and tunnels as supply routes.
PLA also need to be kicked out of Depsang Plains and other areas, and India should build permanent bases and roads right up to the LAC.