edit: since my post was ninja'd lemme change it to a gripe I remember having from a while ago:
I remember giving up on completing the sneaky dispatch quest from my last playthrough because that one guy with Lurk just wouldn't show up. I recommend bumping the progress per dispatch (I think it was 20%? 33% or 50% seems fairer) and/or being able to carry out story-critical dispatches yourself (Kazuma can lurk after all).
Also, there would be days where it would just rain non-stop (like, 3 days at a time). The debt deadline was lenient enough to not be an issue here, but not being able to adventure for days on end does rob the adventure aspect of Adventure Trainer a bit. Maybe make it so indoor dungeons are compatible with rain? (Also, a weather forecast ahead of continuous rain/similar future weather(s) would be appreciated).
Btw, is there a system in place for Kazuma to switch weapons mid-battle? Would be great since he's the versatile one.