Why CancellationToken is separate from CancellationTokenSource?

Question

I\'m looking for a rationale of why .NET CancellationToken struct was introduced in addition to CancellationTokenSource class. I understand how

Answer 1

The CancellationToken is a struct so many copies could exist due to passing it along to methods.

The CancellationTokenSource sets the state of ALL copies of a token when calling Cancel on the source. See this MSDN page

The reason for the design might be just a matter of separation of concerns and the speed of a struct.