I don't think you are understanding who is responsible for what. It doesn't get asked or answered because the developer of the game, SCEA, has no power over the feature being functional with mp3's not being allowed on the console, PS4 by Sony, and most people know this and are waiting for Sony to make the necessary changes first.
Once Sony comes out with an announcement or firmware update for the system itself then I am sure there will be more light shed on the topic. Until then there is nothing that anyone can really do or say because nobody here talks to the heads at Sony. So, if you really want to get anywhere then I would take to the social media outlets and let fine folk over at Sony know that you want your custom music options and feature parity on their latest console. But there isn't much anyone that comes here or works here can do for this situation, unfortunately.

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