> Part of the assignment is using judgment and working in ambiguity.
If trying to clarify requirements is not what they wanted here, they may as well ask candidates to pick a number between 1 and 10 and reject anyone who guesses wrong.
> overkill on the infra and polish
I know its an opinion, but hard disagree on both. Take home tests are intended to show off your ability. Without specific guidance, how can anyone guess how much showing off is expected?
Polish is only bad if it stops you from delivering. Rejecting something that was delivered for being "too polished" feels like you are saying someone did too good of a job.
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In my opinion tests with vague requirements like this are more likely to be a different way of rejecting people who are not a "culture fit".