

If it’s default behaviour for static pages, but not for dynamic pages, then it’s not much of a default. As a user I want ui actions to be consistent, the unknown stuff that happens in the background shouldn’t change the behaviour of the ui. Firefox now mostly gets around this issue by opening search engine links in new tabs (I can’t recall if that’s standard for Firefox or if I had to change settings, but I’ve been using it for years like that), but this wouldn’t have been needed if using the back button was reliable.
I found this 2022-2024 discussion with a few examples of the back button not working as expected: https://connect.mozilla.org/t5/discussions/firefox-needs-to-do-something-about-back-button-history-loading/td-p/4678
I found no announcements of a fix. I also haven’t had much occasion of noticing a fix, since new pages open in a separate tab for me.

“intentionally using low-quality AI output in their work without fixing it”
This reads like victim blaming or scapegoating. That ai company makes shoddy software that outputs faulty results, users output faulty results when using that software, and now the ai company blames the users for outputting faulty results. That some (but likely not all) users know that the results are faulty, doesn’t change that the software itself is faulty.