Wow, that's a pretty comprehensive list. I'll have to second the email attachment issue. If I'm missing something, someone please correct me, but not being able to add attachments to emails is a big deal.
Although I appreciate Microsoft's efforts to close the app gap, please show some love to business users and improve email and other core business functions for those of us who use our phones for work (and not just Instagram).
Hopefully, many of these issues will be addressed in 8.1.