Being able to attach emails to the Opportunity would also be helpful and how you can link any discussions from MessageHub to the opportunity.

I'm receiving a tutorial to use all of your channels and now you have updates that don't keep me in line with the program

In other CRM's the notes attached to an opportunity go away once the opportunity is won or lost. Maybe a note field for the contact record would be better so things don't disappear. Most notes we make are about long-term things.