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TL;DW: because they all use the only mechanism that is still in production. It’s not a good as the top of the line from 2000, but it’s way cheaper than rolling your own from scratch.
Because MiniDisc got it right, and Sony refused to open source the tech.
Ok, but the piece is about plays for people who want to play the retro physical media formats. It isn’t about people asking for new smaller disk or cassette media.