Ok, I must admit - I love the brain and have been using it since v1. Even as far back as v3 I thought the Brain could replace the windows desktop - I mean totally. One would boot Windows and there would be The Brain. There would be links (thoughts) for the Calendar, Contacts, Tasks, email (each as a thought which would automatically link to the sender and recipients), and all of my applications and projects. Maybe the Brain is evolving in that direction - or maybe - ugh - it is not possible to do this.
One item I continue to believe would be beneficial is a working relationship between OneNote and The Brain. I don't consider them competitors at all as I feel they compliment each other. When I embed long threads of email into OneNote I always link the OneNote "URL" to the appropriate area in the Brain as a web attach. Works great. I wonder if MS provides the necessary APIs for Harlan & Crew to embed OneNote into the Brain (as long as the user owns ON, that is).
customized Desktop PC (Haswell i7 4770 3.4 gHz with 32 GB RAM), Windows 10 Pro 64-bit, 256 GB SSD, and a Microsoft Surface Pro 6, Windows 10, 512 GB SSD, 16 GB ram, i5