XKCD should solve the problem the same way Tetris randomizers do. In Tetris, they don't use naive memoryless uniform randomizers for pretty much the same reasons that people are complaining about in this article: you tend to get these long droughts and floods of pieces that you want or don't want. Instead, they just do a random permutation of all 7 pieces, spawn those, then do another random permutation, etc. XKCD could easily do this kind of thing (with cookies, I guess).
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