The problem isn't that I want modernity or have issues with the way such information was obtained,
it's that such knowledge has to be absurdly selective and unused to maintain the pseudo-medieval setting.
Why, for example, no vaccination for the plague was available?
Surely if cancer is understood then immunization should be a the most logical application of similar knowledge in the fields of medicine and biology.
Simply put - if the authors insist on revisiting fantasy conventions they should really avoid putting there things that evidently stand out.
The moment they step outside the tropes I have been conditioned to accept at face value wondering begins, and that cannot end well in fictional universe.
This way one out of place line ends up undermining the setting and ruining a lot of immersion I might have had.