Anyone here a licenced aircraft engineer or perhaps a commercial airliner pilot with inside information?
If not, blaming Boeing or the crew with any certainty at this point is pure speculation.
The skipper had thousands of hours experience, the F/O a good deal less, but not a newb. The 787 has over a thousand airframes delivered and never crashed one until now. So, whatever happened would appear to be an outlier.
Could be crew error, an almighty malfunction or external reasons, possibly a combination. We just dont know yet.
They've recovered one of the recorders. The DFDR and CVR are combined in the 787 and iirc, they have 2 for redundancy. Called Enhanced Airborne Flight Recorder, so I would think a preliminary report will be issued in due course, if the data is recoverable, which I suggest it will be.