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This is the first time in this thread that you've contextually used the word 'required' correctly as it pertains to vacating an altitude.
Still, it logically seems to me that this requirement is met when accepting your DP clearance and therefor redundant to call again.
I tell you what, the next time that you accept a PD clearance, acknowledge it by saying "vacating xxx for xxx at our discretion".
Problem solved!
Well, there is your problem right there. You are trying to apply logic to the FAA.
I am sorry that I didn't put together a proper collegiate level thesis on an anonymous internet forum for you. I wasn't aware that I would be graded on context, grammar and spelling. Fortunately my spelling and punctuation errors didn't fall to a level that caught your attention.
Is it redundant to announce your departure from an altitude after accepting a PD? Sure. But it is also required. How many other redundant procedures do we have? Checklists maybe?
Just because it is redundant doesn't mean it isn't required.