After a certain period of time, it is no longer helpful to see a release that has been shipped.
It should be possible to "archive" a release so that it no longer is visible in dropdowns, the release list, or the feature board.
Shipped releases now appear at the bottom of the any of the Release dropdowns so that you can concentrate on the current and upcoming releases, but still access older ones for reference.
We've purposely kept it still available for reference reasons but we have moved it way down on the list so that it does not get in the way of the day-to-day.
We're unlikely to build "archive" functionality but are hoping that these updates will make it easier to use.