Well, there are a lot of such "oh, bad for you" events in many mods, in XCF and XPZ, for instance. To me there are points:
1) Now it is not so easy to "punish" player for low score, if he or she managed to get enough funding before and/or manage to build economics, scoring does not become something important. Get negatives 2 times in a row is difficult, but having it for one month - more often event, that comes without any real impact. Quit of soldiers in that case could make soldiers care about score a lot more.
2) If the soldier leaves the battlefield alive, nothing bad could happen to him/her, no matter how critical the damage was, that is not very realistic IMO. Once time pass, you will get the soldier back in a very good shape. Partially could be done with some "scars" system from commendation or scripts, that mark such a soldier and debuff it, but I believe we must be super careful with it to keep things fun. Death of super-critical wounded soldier in med bay feels ok to me, promoting the player to use medkits more to patch things on site - also feels more realistic to me.
3) Hurt with Silacoid alien? We don't know what's that is yet, but I'm sure you will be fine, just have a rest =) Not to mention, say, Zombie bite.
If those events would be rare, could shake gameplay in a good way, IMO.
As usual, I'm OK if its rejected, just want to know if that can be good to OXCE project =)