For the life of me, I cannot think of a use case where Date Ranges (purple) are useful in a segment. I don't mean the (orange) dimensions like Day or Month. Would love to hear any ways in which others have used them.
And if not, I suggest removing them from the Segment Creator UI, as users often get confused.
Consider a scenario when you want to have a metric that returns number of visits for the last 7 days. This requires a metric with a segment. The metric will work regardless of what date range is set in the panel.
A step forward would be to have a metric that returns by how much the traffic changed last week vs a prior week (MoM, YoY, etc.)