Using an extension to hide the stories is ignoring them. It's just automated and highly efficient.
I understand that they have no interest in them, however I don't think it's such a burden to just skip over stories you don't want to read.
Well, when you consider that Hacker News was called Startup News when I first became aware of it,
http://web.archive.org/web/20070226001637/http://news.ycombi...
I think that misses out on a lot of the history that made this site what it is today.
Regarding the old name of the site, you did spur me to look up the dates involved (definitely before I got here, which was maybe a few years ago):
"The site was created by Paul Graham in February 2007. Initially it was called Startup News or occasionally News.YC. On August 14, 2007 it became known by its current name."