May I know which of the following two sentences is grammatical?
From what I’ve described which aspects would you say were the “must haves”?
From what I’ve described which aspects would you say are the “must haves”?
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Both are grammatically correct. If you think some things were essential or indispensable in the past and no longer so in the present, you should use "were must-haves". If you think that they are so in the present, you should use "are must-haves".