There are plenty of questions here on SO and articles online about how to handle this mess, but my question is more fundamental: WHY? Quoted identifier seems to be a property of how the engine interprets queries, and nothing to do with the data within. As far as the index and insert/update queries are concerned, who cares? Why does this setting matter?
Suppose you allowed inserts/updates to succeed with quoted_identifier set to OFF in a table with a filtered index - what exactly would break?