By now you should know that claims are different than control. Both India and Pakistan claim each other's Kashmir, India claims Aksai Chin, and China claims Arunachal Pradesh. The reason why India never patrolled or occupied past finger 4 is becasue CHina effectively controlled it after 1962, creating the de facto lac that both sides agreed to observe in 1993. BTW, India still claims up to finger 8. You still have not provided evidence of India trying to violate the 1993 agreement.
Sure but China controlled land that was disputed between the two - F8 to F4 for a year while IA was unable to reverse this control. Control is the next after claim. By controlling India's claims at Galwan to Pangong, China was able to bargain for the deals it's been offering India with more power and better position. India agreed to whatever deal was eventually offered and amended to get disengagement.
AP China is claiming but has no control over. China hasn't yet tried to control it any more than India has tried to control Aksai China but both are claimed by sides while being controlled and under the sovereignty of the other. These are a bit more different that what has happened at Ladakh. Since AP and AC have not become inflamed in recent years to the same degree. With respect to these parts, China has wanted to do swaps and offered such in the past but again India has refused. India has wanted to keep ALL of AP disputed including some parts that China is currently controlling while also taking AC away from China and keeping Kailash, Galwan, Depsang, Pangong (in the entirety of India's claims).
This is the first time India has agreed to a deal. If anything it indicates the Chinese leaders from the 1960s were right. Make offers to swap and/or compromise (yes okay China's claims are unreasonably deep into India to make their offers more palatable) but refuse to give in to India's claims and simply guard and shelve the disputes until the future where one side is clearly dominant. This has proven to have worked after 60 years of development.