Sometimes the answer really is "We can't ship this" and people need to hear it, even if its harsh feedback.
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Sorry I think people think I'm talking about PMs or engineers, and sometimes its them, but I'm actually talking about your fellow designers. Sometimes, its you.
This seems like the kind of thing I might feel myself but feel pressured to "just get it done" so I would actually welcome this kind of feedback from someone else (for a change)