News is, by definition, about current events. Case studies are about past events. So, in general, they can't be the same thing (even if, of course, the publication of an interesting case study can be interesting - and current - news).
"Why can't there be news stories about how awesome the customer experience at X has gotten?": If you really want to know, I advise you to read "Storytelling: Branding in practice".
News is, by definition, about current events. Case studies are about past events.
You are logically incorrect. Well, by your own logic. How can you publish news about a current event? To be written as news it has to be happened in the past.
"Why can't there be news stories about how awesome the customer experience at X has gotten?": If you really want to know, I advise you to read "Storytelling: Branding in practice".