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I know this stuff is hard, but I wonder why the control software allowed the rocket to get so far out of vertical in the first place, that such a massive last-minute correction was needed?
Watching this, my reaction was the same as watching a gymnast almost, but not quite, stick a landing..."hold it, hold it, ... crap." From that explosion, it looks like they should have used up more fuel or have some procedure for dumping fuel just before landing.
That means fuel is not the issue, but throttling is the challenge here.
Kind of hard to understand why any rocket engine can't produce a fine-tuned lower level of thrust.
Wouldn't sending more payload mass to orbit or ISS (e.g. espresso packets) be a better usage of the fuel? Making a controlled descent burns a lot of propellant, plus it looks like it would be a high probability, high consequence on the failure risk chart. Engineering is a great profession.