I downloaded a civ, looked it over and thought it wasn't made well enough so I deleted it. Next thing I get is thousands of messages telling me that every single shipstyle is unavailable because their content all went with the civ I removed. All of them.

I could solve the issue with "verify integrity of game files" but it's still a major pain in the ass each time it happens, and if you go through the workshop, you'll run into more badly made civs than good ones. This and the previous (now fixed) issue with remaining ship styles without ships have made me paranoid when it comes to downloading civs.