Yeah, I use the dagger lights too to gap closer, but I mean, there are only few light “usable” attacks that have a purpose, like the dagger one.
For exemple, with axes, there is a “fastest” combo that deals dmg, that is the " H, L, H, H" no other combo with axe is faster than this and do more dmg.
In a duel situation, both attackers will always be connecting Heavy ones as soon as they can hit a chain, so light attacks would never be used often because they can be interrupted.
I think the Light 4 attack, the 3 and 4 Heavy should have hyper armor only, you think that makes sense? this would strenghen more the final chain of Light, and not be so op in openings on Heavy.