Because this sounds obvious, and would allow us to sequence user behaviour across different channels.
Sounds like it's what appeared in the "Experience Analytics" sneak at the Summit this year.
Experience Analytics Sneak was piece of shit . This has been done for years. This is required for a quick availability of segmented Audience based upon our offline data to our delivery systems like Target , Push notification etc.
When you say done for years, do you mean in Data Workbench?