As to the decision to limit flights and baggage......
This is, or should be, a very clean investigation with a quick determination. As noted above they have most of the aircraft and it was recovered quickly and in a dry environment. This should be easy.
In the event that the investigators with hands on the evidence don't yet know, can't find evidence of a bomb, or mechanical failure, then that must be a scary situation for all. Worst of all would be that the investigators are having the same discussions as go on here.
With no clear determination, then how do you stop this from repeating?
If that is the case then the abundance of caution makes perfect sense.
At this point I think most everyone would benefit from a clear determination, thus I'm guessing that they, the investigators, may be as stumped as we. Or worse, they could have contradictory and unreconcilable info.