Proprietary plugin code serves the need of the purchaser to feel special by getting something customised for them. They can then pretend it's a secret sauce for their business, despite it actually impairing employee productivity compared to, say, stock Wordpress.
It’s not vanished; here it is: [redacted]/doc/groupware.html
(JWZ has anti-HN measures on his site.)
https://web.archive.org/web/20050217051819/https://www.jwz.o...
It seems that the so-called “vanished” article would be more appropriately named the “disappeared” article.
It's really interesting to see a new generation of vertical specific, large scale CMSs emerge (like from publishing with Chorus from Vox[0] or Arc from the Washington Post[1]).
My problem with 'Enterprise CMSs' was always that they tried to sell one hammer for every single type of nail, and actually, use cases for content management are so varied (and often specific to verticals) that you buy a big generalist CMS and end up having to customise and mess about with it so much you're always left in the situation you described.
[0]: https://getchorus.voxmedia.com [1]: https://www.arcpublishing.com
* No need to dig through dozens of plugins to find the one that actually works. Since "EnterPriseCMS" is .NET, you can just write your own!