Lindy Beige does a good job of explaining things. Sometimes he drones on past the point of having explained it, but I enjoy his videos.
So he debunks what most of us think of as berserkers in his latest video. Will that change how people play berserkers? Probably not.
I still find it interesting, and can see how a viking type campaign can use berserkers in a more historical way. Can you imagine how freaked players would be when they hear that they are greeted by the local lord’s berserker?