Frankly, I doubt much good will come of it. It will either be met with crickets or lots of scattered dissenting opinions, likely none in line with the goals of the project.
The danger of such a thing it that it works to derail the process instead of improving it, fracturing the team's (often already fractured) direction. But it could potentially lead to a better product; in general feedback is a good thing.
I would abstain, but I think the placement of the feedback phase is wrong, so I
. The designers should have a chance to consider the feedback and make changes. A simple yea/nay vote to move on at that point is the wrong way to go. It should return to design after feedback.