Facts not in evidence.
The "classic" golang.org documentation was simple, easy to search, and consistent across user agents. The pkg.go.dev documentation is... well, bluntly: strictly worse.
There are longstanding bugs in basically all user agents. The README for a module is unavoidably truncated by default and requires a click to expand. And the navigation panel on the left is only rendered beyond a certain browser width, and changes as you scroll -- in total, a UX disaster.
I'm so frustrated by these changes. It's one thing to update the look and feel of a site over time. I understand and that's fine. But this was clearly a design by committee, with no single coherent direction. The net effect ticks a lot of boxes but is just functionally worse.