It would be helpful if someone compile a list of medical tech that we can acquire in classical antiquity and current trajectory of our technological progress.
Classical human anatomy -> Can improve, requires losing or evolving Purity first so we can experiment on corpses.
Empirical primitive sanitary theory -> Can improve to classical sanitary theory. The primitive version is focused primarily on external and general infections. The classical version is actually less accurate in places than the primitive theory of curses, but covers diseases of excess, dietary imbalances(soon to manifest as urbanization continues to climb, we've been offsetting it because of Sacred Warding and the Garden producing a more balanced urban poor diet than the norm) and psychological maladies better.
Herbalism -> Pending Distillation to achieve drug isolation. Need a non-poisonous organic solvent to do any of that.
Oral rehydration therapy -> Intravenous rehydration therapy. Requires steel needles primarily, but it'd be difficult to do safely in the classical era.
Primitive insect repellents -> Pending Distillation to get something with better kick.
Soap -> Pending distillation to get Early Antiseptics
Spiritualism -> Classical psychology is going to be a difficult leap due to religious continuity. Germ theory is a long way behind optics
Biggest thing? Get distillation via Alchemy and Kilns. Access to hard liquor, then surgical alcohol is useful for everything from drug improvements to surgery
So the last time someone sent a trading mission to the King of the hill was 60 years ago. OK you can say the plague distracted them, but what about before that.... the only thing I can think of is way the hell back when we first established the law, highlanders again. People seem oddly reticent to talk to us.
Because they already send people to us all the time. International Games remember? Any attendant doesn't need to send a mission specifically to us without a goal.
And we've a little reputation for being crazy in everyone's legends.
...wonder if the Metalworkers remember whats up with the fire cave.