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I think at the most basic, Chaos in 40K is based around either the Legions or Daemons, with additional support to Renegades and things like Chaos Knights. Daemonkin was additional design requirements they just don’t have space for, especially given there are no Daemonkin models.

Since the rules now support daemonkin-style armies out-of-the-box, they don’t need to spend design resources on a codex for armies with no models. Instead, you get little helpings like Disciples of Belakor.