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It's funny how the designs strayed from the yearly common design (which for a unified Europe ideal makes sense) for speculative reasons (how do we get people to buy these stamps and not use them?).
I think all/most CEPT countries agreed in early 1970's that a common theme serves national purposes better than a common design.
As for speculative reasons.... Well, I would NOT definitely blame postal administrations for this. They just issue stamps that they hope people will buy (and use). It's the money-hungry collectors/investors/stamp dealers who blew it all up. LOL.