why should there be a assumption that things were overlooked?
what exactly was overlooked?
up until the galwan incident, scenario was on par for the course, things were happening exactly like how they happen hundreds of times every year.
on which exact date you think the balloon should have gone up?
1. the assumption is based on the fact that report of heavy vehicular movement of PLA in Demcok came in during mid April that was around a week before PLA started there movement on Pangong lake. Hence, intelligence was there but why didn't it was used, thats the main question.
2. Untill Galwan (15 June) scenario was not at par, we lost patrolling rights bw f4/f8 and it was not normal incursion as usual (no of troops, heavy artillery, infra equipment etc)
3. Moreover, such incursions where no limited to Eastern Ladhak but were also there in Sikkim (IB), Arunachal (LAC), Uttrakhand (IB).
4. If things are taken in casual manner even in settled areas too then we should be ready for such incidents on annual basis as we are reactive mode instead of proactive one.
5. Galwan showed we can respond in the manner chinese understands as there casuality is higher than us, operations of 29/30 Aug showed we can do prememptive operations too. Such prememptive operations or alertness should be depicted round to clock to create fearful china.