I really don't like "speculative" design, I find it like games you played where you were a kid where you just made up rules, and could change them at will. Also doing a take-home test on some speculative designer right now =/
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They can be a useful tool for helping understanding how someone approaches their craft & fairness purposes. Some of our design disciplines will ask you to bring an artifact of your own to talk us through it; our content team does have an exercise but it's designed to be short
I've probably ranted about design tests on at least a dozen or so threads just on Posts alone — it's just my opinion.. I'm not looking for a debate