If you have deer carcass next to your TC, villagers will default to that if sheep run out. But if you have berries next to your TC you have to explicitly tell your villagers to gather them after your sheep run out. It’s still a food source so it should be a default for villagers who are gathering food.
Is this so hard to use Shift to order your vills to go for berries after sheeps are gone? I use Shift even for sheep meat gathering because there are rare bug when some vills become idle even if new sheeps are right near them. Same with Deers+sheeps mix gathering, when you use prof. Scouts to bring deer meat to your TC you need to mannually order your vills to switch between deer\sheep collecting each time when some of this resourses are expired
NO THAT WOULD BE BAD FOR RTS GAME