ValhallaGH
Explorer
Ritual with world shattering components are not known to most, have rare components and need a lot of time to master. Its easy to add in other requirements...
I think he was referencing the ability of a seemingly innocent and innocuous ritual.
Example: combine the Animal Messenger and Comprehend Languages rituals. Suddenly, towns can always communicate with each other, clearly and accurately, within reasonable distances (about 12 hours travel time). Consider the impact this will have upon diplomacy, commerce, land rights, legal actions, and probably a few areas I've forgotten about.
Example: How does the existences of the Eye of Alarm ritual affect theft and burglary in a city? Presumably, a company that provided such spells as a regular service would be in high demand, especially the permanent variety.
Small, innocent rituals that can have dramatic, world altering, effects upon a setting when you begin applying them across the board.
Not that you ever have to apply them across the world. It's your world, most of it does what you want it to do, and sometimes what you want it to do doesn't make much sense.
Good luck.