There is nothing wrong or untoward about removing the wreckage from the impact site. They have had enough time to document the geo-locations of the major pieces and at the same time to remove the human remains to a separate location.
The very few worldwide experts that arrive after this removal will have no trouble in assessing the mechanical state of the aircraft as to an inherent fault (e.g engines) vs external caused in-flight damages. This all goes with the expertise and integrity of the investigators. It won't take more than a couple of hours to confirm the engine condition either from internal or exterior events. The aircraft structure itself will need a more labour intensive examination to separate in-flight damage from impact damage.
The follow-on issues of suggesting human blame and/or contribution will use up most of the onward discussions including the wild conspiracy theories sure to follow.
So far I have seen from the photos some unresolved unusual damage to some structures but at the same time if an investigators eyeball is available it should be easy to resolve causes. As I said much earlier one should not assume holes in structures mean anything beyond crash impact, unless such holes can be traced back in a trajectory analysis to a common source. That's why it is so helpful to have all the major parts in a small common area undercover from outside.