I also had a conversation with the product team back in January 2009 the product FAQ was saying Cascade Delete is operational was a mistake. This is a very bold move by Microsoft telling object snobs remoting and related technologies may scale better with intermediate persistence which is the reason for all the noise from people paid to create complex objects.
I also told them I will port OSLO to Oracle in one month at the time so now I think the work will move to automated SSIS services consuming DBMS vendor agnostics WCF services. This makes enterprise development almost a simple task.
In Data Microsoft moves are mostly reaction to new products on the market and industry changes.