Ok team Upwork, since you deleted my answer, you could at least have kept the link that I provided for Pascal or at least have give him the right answer.
If you get enough clients who do not leave feedback this could have a detrimental effect on your JSS.
I don't know why Upwork should be so insistent on this, because the visible feedback often bears no relation to the invisible feedback. So your profile could be a galaxy of stars, but behind the scenes you may have been dumped into a black hole, which will crush your JSS.
@Mariusz O wrote:
I think so. Many clients have no time to leave feedbacks.
Ok, then I think so would have been a better answer than no.
The official answer is: yes. A pattern of contracts that end without feedback can reduce your score.