A fact.
One fact:
our beloved engine performed perfectly well on the LHRSIN leg (12 hours or more?), we are talking about several hours of continuous operation without a glitch. It cannot be a coincidence that something happened just after taking off from SIN, there must be a link in between the stop on the ground and the accident.
So I would exclude the engine design or materials and look carefully into what happened on the ground. I think this is a fact.
So either maintenance related or "ground related" (ingestion, or similar).
We cannot ignore the fact that engine nr2 had operated for many hours without a glitch just before landing at SIN, the stop at SIN must have a factual significant relation with the problem, whatever this was.