Improve infrastructure doesn't shorten the distance of mainland China and Indian frontiers- Tibet has three main roads connecting It with China, The one in east takes 10 days from Chengdu, and is most treacherous, this one can be hit by India, The one in west is also a long road It takes 5-6 days to reach Tibet from Kashghar and can be hit by India. The the 3rd is from Golmud, It takes 2-3 days from there there is also rail link along this route, this one is the safest though, you can be sure Golmud will be on Indian radar as soon as hostility breaks out, since all of Tibet's oil comes from there- This 3rd route has more than 100 bridges and tunnels-
When an army moves it needs food, oil and ammunition, every few 100 Km covered means thousands of million dollars and in this case we are talking about thousands of Km, long treacherous valleys in hostile climate, the Chinese troops will need oxygen supply chain also to reduce altitude related sickness- Indian army is not moving much, they are right there within 50-100km range- 300 thousand troops sit in the North East which has oil wells, refineries, produce food, with very good weather unlike Tibetan cold desert which stretches thousands of Km- You must be knowing the story of Salahuddin, and what he did with Europeans who marched out in deserts of Syria- Tibet is not the same but both raised Logistical question- improved infrastructure may reduce costs and time but It will still be costly-
Chinese withdrew in 1962 because the geography didn't suit them, and feared that a counter attack from India could expose them else where-
Who will win remains to be seen, the local population and Tibetans are with India, There are Tibetans enlisted as Special Forces battalions in India- We are better placed strategically and our logistics are short- The only problem with our forces is the inability to put heavy armor and mechanized equipment in some sectors like Tawang-
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Note the patch on his shoulder- These are X-factor in any India-China future war, their numbers are unknown- These battalions were used very well in 1971 India-Pakistan war-
You can consult any artillery officer on this- Or even a normal soldier, these are basics, only a kid will do such things like ChineseDragon suggested in his lego games-