Dynamic Flow Variables Support in Apigee policies XML Elements ?

Why some of the Apigee Policies XML elements supports dynamic flow variables why some elements doesn't support same ? Is there any reason behind same like performance / policy maintainability ? Isn't all the static values in xml should have reference variable support ?

Any pointers in this direction ?

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I would guess that the "MVP" got implemented first.* Things like CachePrefix currently don't support dynamic values, but you can always use dynamic Cache Key Fragments instead to achieve the same result.

*source: none at all. It would be good to hear from someone in Engineering.