Inspired by this question, which presents a user's idea for an air scrubber and asks for suggestions.
My first reaction was to vote to close it as a Naive Design Question, but that doesn't seem to apply, since the user seems to have put a non-trivial amount of time thinking about this. I lack the ability to judge how good the idea is, but it does have a +2/-0 score, so at least two people thought it's good enough.
My second reaction was to simply vote to close it as too broad. After all, this question isn't objectively and absolutely answerable: many different answers with different suggestions are possible and equally "correct". I don't think this sort of question is suitable to the StackExchange format.
However, StackExchange does have another site which is effectively a "check my implementation" site: CodeReview. This could be interpreted as an indication that such questions can be adequately answered in the StackExchange format (especially given that the site was popular and self-sustaining enough to graduate).
Evidently, it is up to the individual site to determine its scope, so the question remains: Do we want "check my idea/implementation" questions on our site?