[vessenes]

I do not believe that chosen plaintext attacks are obsolete. Any time you have an encrypting oracle setup in which the scheme itself does not require some sort of modification of the plaintext itself, you can reach for a chosen plaintext attack. I believe mitigations are known and can be applied or required in standards, but I don't think it's a 'dead' area of cryptanalytic research -- there's so much devil in the details of implementations around the world for these schemes that it seems almost impossible to imagine.