If you allow below 2 powerful columns then standalone p1, p2 plans can encomass many things with out adding complexity of sharepoint and sql server.
allow attaching document to CDM table(just like SP list) and nvarchar(max) azuresql
Updating to Started and adding @LanceDelano for future updates!
Regarding SharePoint : Updating to under review and adding @LanceDelano from our team who is looking into this area.
Regarding nvarchar(max), we have work underway to support expanded data types to cover this type of support.
re: attaching documents in CDS. -- Yes, this is very much something we're working on. No dates yet but very high on our priority list.