i was there...
Not much has changed, the whole contraption still is, to a frightening extent.
No, you'd have to go back further than that.
By the time 4chan came about, the web was starting to crystalize into platforms, and standard tools and databases had been developed. Design and UX was starting to be important.
At the time of launch, I distinctly remember that my classmates thought 4chan was weird for taking after "primitive" Japanese image boards. (Craigslist, too, was considered dated.)
The early "duct tape" days were the era of EzBoard (1996; before phpBB, vBulletin, and Invision), Flash (1993), Geocities (1994), Angelfire (1996), Lycos (1994), Dogpile (1996), ICQ (1996), early AOL Instant Messenger (1997; before Trillian, Gaim, Libpurple), lots of little IRC clients... lots of CGI, Perl, and C all slapped together. That's when flat file databases were a norm, not an exception.
4chan came around the same time as Digg and Reddit, and in response to some of the platformization that was already starting to happen (Xanga, LiveJournal, and Blogger in ~1999). The machinery and practice of modern web engineering was already falling into place.
It was such a good product.