You can also get a little nasty about it and ask the PMs to estimate the ROI, customer satisfaction, or opportunity cost while reminding them that you need them to estimate as accurately as possible since they need to hit their business objectives.
I've done that one before too, a bit bold, but usually helps people realize that certainty in estimates doesn't exactly work, but feedback and prioritization do.
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You can also get a little nasty about it and ask the PMs to estimate the ROI, customer satisfaction, or opportunity cost while reminding them that you need them to estimate as accurately as possible since they need to hit their business objectives.
I've done that one before too, a bit bold, but usually helps people realize that certainty in estimates doesn't exactly work, but feedback and prioritization do.