sql server 2008 partitioning column

According to microsoft An Identity column cannot be a partitioning column canadate.

The partiti开发者_运维知识库oning column cannot be an identity, default or timestamp column.

They do not clarify why that is nor has my google foo turned up a reason.

I have a theory, can SqlServer not automatically insert the row into the correct shard based on the identity field if it is the partitioned column?

---

Your reference is for SQL Server 2000 and partitioned views.

SQL Server 2008 allows Identity fields as the partitioning column in a partitioned table.

See this link, excerpt below:

All data types are valid for use as partitioning columns, except text, ntext, image, xml, timestamp, varchar(max), nvarchar(max), varbinary(max), alias data types, or CLR user-defined data types.