The ONLY thing it does is allow you more opportunities to get corpses. I would also argue, because you risk your soldiers when doing it, its a good example of how skill-based gameplay is rewarded, rather than artificial difficulty barriers making everything identical each playthrough. I've used Evac Corpses for a long time, and I can safely say, while it makes things easier, it certainly does not allow you to arm 20 shinobis with fusion blades the moment you get that tech. But keep in mind that it's practically a form of cheat mod with LW2's progression setup. If you just want corpses easy with no concern for the game's designed progression, by all means grab it.
LW2 is very much balanced around corpses and resources being rare, rather than simply getting improved swords for every shinobi the moment you encounter your first stun lancers, or bluescreen rounds the moment you encounter your first mecs. Originally posted by TwinuX:Evac Corpses certainly helps boost your research and weapon construction, but it also quite heavily breaks LW2's progression.