Despite their medical knowledge being atrocious... the sterilization spell is the wet dream of some medical specialists, just imagine, you say a few words, and an entire area becomes sterilized of bacteria.
The magic they have may have had an adverse effect on their research culture, it isn't really explored but there are hints this society became a little too dependent on their magic, and with the religious practices going hand in hand with the magical practice they slacked on the more "mundane" areas.