It would be nice if there was a bit more rhyme and reason to what parries in this game work against, though I'm doubtful NRS will do an overhaul of that particular system if we get a patch. Luckily, this isn't that big a deal, as their are other things in Alien's arsenal we can Parry, and as for Alien's reversals, we can just block them or armor break them like everyone else.
If there's one thing I honestly hope gets changed in the Unbreakable v Alien matchup, it's the fact that acid damages Sub while Aura is on (same with caltrops and other DOT effects) and is completely ridiculous, invalidating a very large point of the variation. If there's anything we should petition Paulo about, it's this.