> Curated and organized websites tend to fall out relevancy and decay very rapidly. Might as well just let people post as they see fit and then we can find it by searching.
Your points about nostalgia I sort of agree with but this part I take issue with. Many sites use blog software which does the whole chronological ordering. Unless the site's particular blog theme exposes archives, a sitemap, or the author meticulously tags (and the theme shows tags) it can be stupid hard to navigate around blog-like sites.
Blog-like sites also tend to have a partial chronological list of posts at the root of the site. If you're writing some personal journal or topical things that makes sense. For someone writing about some particular topic(s) this is a navigation anti-pattern. It doesn't matter if the latest post on Topic A was posted on Monday. As a reader interested in Topic A you want all of the posts on it. Most blog-like sites make this challenging to find or don't expose it.
I don't really like "just search" as a replacement for categorical organization because most search sucks anymore. That might have been ok for Old Google, before the DoubleClicking, but now it's just another navigation anti-pattern.
Interestingly, had Web 2.0 concepts been implemented a bit better by CMSes, navigation of sites could be ably handled by user agents. A site with an OPML/Sitemap XML pointed to with an "alternative" meta tag could let a user agent (or service) build nice navigation for sites automatically no matter how the blog-like CMS organized the HTML.