It's the American CDC which came to downplay the Natural Immunity. And it's the American policies which steers even health policies of many, if not most nations of the world. Fears of bad-press, travel bans and all sorts of potential consequences beholds a chunk of the world to what the CDC says. Perhaps a lot of the supine fellowship is subconscious. If and when the CDC comes up with some very different policy then you will see many nations will adopt those policies. Only if the world could ever know how political and profit driven the CDC has become.
About the Natural Immunity: I have yet to see a single study which would indicate the Naturally-Immuned people getting serious reinfections compared with the vaccinated ones. Anyone could cite me such studies?? Yes, antibodies do drop but they also drop in the vaccinated ones as well. It is the 'Memory Cells' which continue to provide the immunity in large numbers to both vaccinated and Naturally-Immuned people. But I fear, if some virologists are correct, massive immunizations and repeated multiple kinds of vaccines and boosters could lead to a situation where the virus would learn to evade most of the immunity--whether through the vaccines or through the infection.