If you do large jobs, an RCDD is a help. If you do consulting, an RCDD is a big help. If you manage a very large account(s) then an RCDD is a very big help.
Why?
It's like a university degree. You may be brilliant, but you're not going to get a job at a Fortune 500 in any sort of management position without one.
You may know all there is to know about Telecommunications - but how do you prove it?
An RCDD is a way of showing those that make the decisions and sign the checks that you've completed a rigorous course of study and that you CONTINUE TO TAKE CLASSES EVERY YEAR to keep yourself current. When I got my RCDD, way, back when, I believe the requirement was 45 hours a year. I don't know what the requirements are now.
Is there a value to an RCDD? It depends. There was a lot of value to me as Network Manager of The Bank of New York. Is there value to me now as a Plant Man at a NYC government agency?
No.
Education of any sort - especially if it's in your chosen field is always good. But is the Return On Investment there?
Larry is a lot more current and can probably give you a better answer.
I'm just a beat-up old Telephone Man, hobbling off into the sunset - so take what I say with a grain of salt
Sam