I heard this idea, or variants of it, quite a lot recently.

Some of the examples I've seen it tried - I've seen the people setting it up trying to fix the outcome by carefully choosing the question, then providing expert advice on options scoped by the question.

Framing of the question is a powerful tool to promote the outcome you want, and avoiding ever asking certain questions is another.

Not saying it doesn't have it's place - you just need to be careful that the process isn't used to try and legitimise what would otherwise be unpopular policies via concentrated persuasion on a small number of people.