For those looking for a realism (as opposed to game balance) argument:
Monasteries help your civ research things like astrology and calligraphy, which for a time were associated with true scientific advancement. But eventually, research into astrology and calligraphy gains you nothing further (in terms of scientific progress, obviously it can still continue to enrich your culture). We can thing of scientific method as the point in the game when this happens for your civ.
Monasteries help your civ research things like astrology and calligraphy, which for a time were associated with true scientific advancement. But eventually, research into astrology and calligraphy gains you nothing further (in terms of scientific progress, obviously it can still continue to enrich your culture). We can thing of scientific method as the point in the game when this happens for your civ.