Evacuation?
The idea of evacuating this aircraft will be debated for a long time. As a co-pilot who aspires to command in the not too distant future I'd like to think I would have behaved in the same way.
For a fuel spill on the gate rapid disembarkation (i.e., without slides) would be appropriate. For fuel leak event in a remote area then unless there was a fire then the best course of action is probably to remain on board. The key word we use is "catastrophic" and despite the nature of the accident I don't think it warranted an evacuation from either the flight deck or cabin if the cabin crew thought it was catastrophic.
Just my thoughts, I haven't seen anything specific about this incident and look forward to reading the official report when it is published.
For what it's worth, I would assume the cabin crew were experienced - this is a Worldwide route and there have been very few recruits (apart from transfers from Eurofleet). Many Worldwide crew have been flying 15 years or more.