"Facebook email, which they call messages, is becoming completely unusable as a personal or business productivity tool."Urgent Changes Are Needed To Facebook Messaging
So, what you're saying is... you'd like Facebook to work like Outlook? What about spreadsheets? Should it do Powerpoint presentations, too? Should it login to your bank accounts and manage your finances? A Salesforce plugin perhaps? So, basically, given enough time, if every web startup made Arrington their product manager, every application would do the exact same thing: everything.