I am of the opinion (as a professional RPG writer) that rules reference is different than reading and should be treated differently. Books (or portions thereof) written to be read should inspire and entertain. Books (or portions thereof) meant to serve as rules reference should be succinct, direct and unambiguous. It isn't an either/or situation.
This is a playtest document. Look at their bestiary here. No fluff. Same for the class skills and such. Compare the PF1 rule book with the playtest rulebook. Expecting that the PF2 release rulebook is going to be the same language as what they release it as seems silly. We’re not here to test the entertainment of inspiration of the rulebook. We’re here to test the rules to make sure the game has a solid mathematical underbelly for future expansions. Fluff at this point is pointless and detracts from testing of actual game mechanics which is the important part. It’s also why I won’t judge them on the playtest adventure. We all know Paizo can write those as well as good splat books. What we need to do is make sure the basic rules and math in it are fun and work and scale.