I used to get that augment from R51 Venerable Close Assault Proxy Loadout card, and while it was potentially a downgrade to classic melee for a lot of people, I have to say that I kinda liked the principle of that augment. If I remember well it was removed for balance issues (too hindering), but it could have been a great augment with just two simple additions : the ability to headshot with a thrown knife, and the ability to still be able to use light swipes.
When can we hope to see that augment back ?