kungfu panda - as well as passing Perf 'A' I also operated heavy aircraft under hot and high conditions. Of all posters here you are the biggest worry, making absolute declarations, e.g. "I think that it is disappointing that so many professionals fail to recognise that this was not a normal take off."
Based on nothing more than an amateur filming a take off from a passenger seat through a passenger window with a smart phone! Think about it man, it is so ridiculous to not even bear thinking about, you have no supporting technical evidence for your wild claims, for that is all they are. As I said in my first post on this thread, we are largely spoilt by having much more runway than we need, it is only when we get into the heavy aircraft/shorter runway/high temp/humidity/altitude that we start to realise that some runways are just, and only just, long enough. Try Johannesburg, (14000'), on a summers afternoon heading off on a ten hour sector, or Singapore, (13150'), any evening, heading to Europe only a few kilos below the limit for the conditions, both in a B747-400, believe me, runway ahead never disappeared so fast.