Many of us had been using Adobe Analytics for years before a segment manager existed. We had hundreds if not thousands of segments already created. It is not ideal to have to click through each one to see if the rules are still relevant. It would be much easier if the "Date Last Used" was an additional column you could sort by in the manager. If I saw that a segment had not been used in years, I would be able to delete it without hesitation. The "Date Modified" is partially helpful, but this only goes back to mid 2014.