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[Jojoya]

I dunno why the JP guide got right to explaining mechanics and the EN guide was uh...

Because the two sets of videos has 2 different purposes.

The starter guides are a marketing tool aimed at those not already playing the game. It covers simple game basics that a new player will experience.

The JP "House Party Play" (actual translation from the titles) guides are targeted at those who are now players and teach the basics of group combat. They don't cover a lot of the things mentioned in the starter guides, such as quest types and using the game map.