What's worse is that it didn't used to. The current version is a rewrite, based on a wiki-interop framework (developed by the original wiki's creator, so it's not a hostile takeover, but rather an attempt to do stuff that wasn't possible originally).
For no apparent reason. Five years ago it was part of the world-wide web and open to mashups and automation, now everyone needs a custom deobfuscator (albeit a simple one).
The SPA rewrite of wiki was an extremely bizarre move and I'm still not sure why they did it. (For those who aren't aware, this site is the wiki - the original one, and was mindblowing in the 2000s.)