I know we haven’t had a full taste of what the base game has to offer --in respect to fighting combos --but I think it’d be really cool to have more combos added to the game via expansions to keep the combat fresh and exciting.
From what I’ve read, such as Lorenlyr’s “A Glimpse into the Past” series on the KC:D subreddit, the game’s combat is based largely on German schools of thought. I think new additions and variations/combos could be interesting, e.g., the Italian Fior di Battaglia/Flos duellatorum (c. 1410): https://www.youtube.com/watch?v=vyVu0z4aGFc (3:05 - 3:27 is especially interesting/cinematic)