Magic: The Gathering’s new Beyond boosters have only 7 cards

This seems like such a strange idea for multiple reasons.

• Didn't they just axe Set Boosters because there was too much confusion or cannibalism between Draft and Set boosters?
• Like TFA says, March of the Machines did a 5 card booster and that flopped hard. Granted that had only 50 cards in the set and duplicates were more of an issue but they just had a failure with this.