I think they need to look at raids again.

A lot of them are pretty pointless. Like, what's the point of Skeleton surprise for plains tier people? There is no difficulty and the resource is useless. I guess you can obliterate it into coal, but there are better ways to get it.

They need to turn off more obsolete raids as you progress.

Also, the raids can be too common, you can start to feel annoyed by them.