This definitely feels strange to use the word raid for a mundane group-sized instance.

It's a thing to refer standard features in non-standard ways (guilds or chat channels as ls, public quests as behest, dailies-on-a-36h-timer as leves, aggro as innimity, etc.), its another to use a standard word for something else. This creates unneeded confusion.

Why couldn't they make their own word, since they are so good in renaming features?