Since it's not possible to delete lists and segments that were used in send out campaigns, it would be great to have the possibility to hide/archive lists & segments that you don't need anymore.
This with effect that they don't appear in the segment/lists box on the campaign creation page where you can select them.
Yes, yes, yes! Same with journeys with over 10 contacts. My account is becoming such a mess with old lists and journeys that I know longer use.