Earlier quoted context omitted.
> Actually, frames were ugly, limited and not really ergonomic but they weren’t a wrong pattern. They were. The most fundamental part of the WWW architecture is the URL. URLs are more important than even HTML or HTTP. Without addressability, the web doesn’t work. Frames break URLs because you can visit a site that uses frames, navigate around the site, and the URL won’t change. You can’t link to the place you arrive…
There were workarounds to load a direct link to a frame so that it loaded properly in the frameset. If you visited a site that did not do that, then they were just not trying as hard.
Whether or not you see it as a big deal is up to you, but I personally have vivid memories of receiving links from users who were trying to share or show me a particular page, only to realize that they had copied the address bar's content of a framed website.