I think the question is:
Are Berserkers intentionally at a lower CS than Longswords? Or was it just overlooked when longswords got their most recent buff?
It wasn't overlooked - @Gazebo noted it. But it wasnt this way before. Before longswords got their buff to 22 cs, when they were 20 cs, Berserkers had the same cs. They should be the same strength again.