I would love to have dedicated sections of the book to lore about the world of the Wandering Blades, the jianghu and perhaps even the world outside of the jianghu.
The combat system right now looks really cool, but without more context about the world of the Wandering Blades, it might be difficult to begin roleplaying without a foundation to go off of.
In particular, I would love more information on the different Martial Art Sects featured in the Youxia class section, it could help with character creation and help create connections with NPCs and help build the jianghu the players will be a part of!
I think in the vein of lethal melodrama, I would also wish for mechanics to facilitate that, whether it be rolling for a tragic event that spurred the players on their journey, or rewarding players making dramatic moves!
If there's anything else I can think of I'll continue posting in this thread!