I am aware of their impact on the economy and am working to balance them. The goal wasn't to replace farming, but to add an alternative means. As of right now, quarries are default rates which was intentional to have a base to start with.
Having no quarries has just as much drawbacks as having them. Players fighting over public quarries, theft, shortage of nodes and a non-existent lowgrade demand. Going forward, quarries outputs will be nerfed and take damage during operation, which will be repaired if in range of a TC.
If I am unable to balance quarries satisfactory I will consider removing them. For now, they're an outlet to expand the functionality of the game and give players something to invest their stockpile of resources and components on.