Bits of every domain are obscure to someone. But it seems to me that the only domain for which use of acronyms in article titles ever seems to provoke this level of irritation is Microsoft's. Makes me suspect that this particular debate is really just a proxy for a different argument altogether.
Is this really the case? I've been using it since it's inception (never used "Indigo" in production). At the time it was a godsend because our company was moving to a SOA (ahh... the dark ages) using Oracle Fusion Middleware, and judging by the job postings over the years I suspect many other non-Java/Oracle houses also adopted WCF.
I did not realize it was considered an obscure technology.