Just watch this video and you will see these 2 things that needs to be fixed right now. Until that happans it is a 1 way ticket to win a duel.
https://www.youtube.com/watch?v=zUJhcQMhZ_M&t=1036s
The 1 guys says it needs to be in the game but it should not be. In duels it is too overpowered. Lets say the assassins. They lights are all ready quick and if they use light faints they just kill the fun out of the game.
Guardbreak softfeint is the best thing that can happen to this game regarding current defensive meta. It CAN make a turtle guy who is ready to GBC you or block anything, get hit. It's not broken, nor impossible to react to, it simply gives 1 more level of depth to the defence which is already too simple. I STRONGLY advice it to get integrated in game and made easier to do. No changes needed at all.
Softfeinting light attacks, on the other hand, is not welcome. Simply because there are too fast lights out there.