[jedifans]

Before the feature files get written, have a conversation with the PO and other stakeholders.

Involve a QA person and relevant developers.

Catch the changes early, ask for more examples of the feature or goal, "have you thought about ...", "What happens in this case...?".

You will get better quality features with less rework, because you are writing the thing the PO actually wants and cover off edge cases before they crop up in testing.