Imagine that the European Parliament passed a motion saying that the Brexit deal was not acceptable to them because the UK was denying freedom of movement after the transition period, do you think that would be helpful to talks?

Do you rather think that in the UK the PM would be indignant that the EU were not listening to our firmest red lines, and that on this basis there was no hope of reaching a deal?

Different if the European Parliament passed a resolution saying it should be £49 billion not £39 billion. Both sides have already said they would negotiate on that, so it just shows the EU really care and give them a little extra impetus. No red lines breached.