Hello, after a discussion with the developers. The AI managers having less formations available for selection was a intentional decision.
But having less formations doesn't necessarily mean less tactical diversity though, as we've greatly improved the way AI managers choose their roles and team instructions.
We apologise for the confusion. In the link below, you can find a detailed comment talking about this decision, thank you.
https://community.sigames.com/forums/topic/568484-official-football-manager-2023-early-access-beta-feedback-thread/page/26/#comment-13772691