Kick slash is currently broken because there is no reliable counterplay against it, whereas kick-slash is a reliable strategy against your opponent.
The game moves towards making feints until the opponent starts blocking these potential attacks which make his feet movement slower,
then walking up to him, kicking him, and straight-up attacking. You will always win against an opponent with slower movement.
You could potentially try to avoid it by going sideways or backward but your player movement in that situation is slower so you become vulnerable for kick slash again.
You could try chambering these potential feint attacks but chambering is not reliable enough right now to pull this off. But in that situation, you have to take a risk where your opponent just performs a reliable kick-slash strategy.
Risks on the current pusher/attacker side:
1. He only risks being kicked but that can be easily mitigated by not getting too close to your opponent. You are walking forward so that is simple to do since you have quicker movement. You can fake walking up to him causing him to try to kick you which makes him unable to perform kick again for the next few seconds which in turn put you in the comfortable position of performing a reliable kick-slash strategy.
Risks on the current defender side:
1. He risks being kick slashed when trying to block feints causing him to be slower.
2. He risks being hit when dropping a block in order to kick and survive the potential kick slash.
Both points can be heavily abused by the pusher/attacker by holding an attack and walking up to your opponent waiting for him to either drop the attack->you attack him or if he does not do anything then kick slash him.
One possible solution against such broken mechanics would an allowance to kick while holding block attack, right now when doing block+kick we trigger bash attack.
If we were allowed to choose separated keyboard shortcuts for bash and kick, the opponent would be able to reliably kick me while I push at him making feints.