With no scientific backing,
my assumption would be knee going past vertical on a jerk will make it harder to recover.
Imagine with full clean vs full snatch - how often do people get pinned with a full snatch?, I have seen it once...it was fricken weird
I imagine same idea, sure you can split snatch lower like that, but you also have less weight to recover from - with jerks you just added like 25% more weight, big difference in recovery.
That being said, I have seen some awesome jerks from people who can get low, but because they split their legs further out, not because they throw their knee out
From my experience, I do not want anything that will let the bar sit in a position that wants it to go more forward then it already wants to go...
85kg - 121kg Snatch, 150kg Clean/Jerk, 160 Clean, 160 Jerk, 185kg Front Squat, 215kg Back Squat,