Instead of trotting out the same responses, that people could have read already, why not just accept that it is not an unreasonable request to have additional functionality so people may use the tool in the way they wish. The volume, persistence, uniformity and age of these requests for additional password security for objects within the app is such that app level and OS level sign in obviously does not meet the wishes (which may not be the same as your perception of requirements) of Evernote's (paying) customers.