I'm a pretty shallow Scrabble fan, but to me Beef's board suggests tournament-level nerdery. QI, QAT, and ZA are the three most statistically valuable words in Scrabble, and iconic plays; KA is also a common way to dump a point-laden but ugly letter. I don't know who knows ZINEB unless they're actively studying Scrabble words or are in a relevant field, which Beef is not.

He also knows his two-letter words, including TE, which isn't legal in North America (it is good under the larger SOWPODS dictionary used everywhere else). But I think that in Beef's fantasy, the U.S. has finally adopted SOWPODS, and I think he has a right to that fantasy.

He's also clearly burning the B on purpose -- maybe setting up a bingo, maybe deliberately clogging the board for his private pleasure.

(Everything Scrabble by Edley and Williams contains the anagram "UNBALANCED RACK = CAN EARN BAD LUCK," which is just one of the many Achewoodian things about the Scrabble world.)