Back in 2005, a bug report was filed by Kjetil Kjernsmo, then running KDE 3.3.2 on Debian Stable. He wanted the ability to have each connected screen show a different virtual desktop independently, rather than having all displays switch as one unit.
Over the years, over 15 duplicate reports piled onto the original as more people ran into the same wall. And that’s not a surprise, because multi-monitor setups have become increasingly common.
The technical reason why this issue stayed open this long comes down to X11. Implementing it there would have required violating the EWMH specification, which has no concept of multiple virtual desktops being active at the same time.
The KWin maintainer Martin Flöser had said as much in 2013, effectively ruling it out for the entire KDE 4.x series. The only realistic path was through Wayland, and that path needed someone willing to actually walk it.
Someone finally did. The feature has now landed in KWin’s master branch and is set for a Plasma 6.7 introduction.
No, it does not. You can write good code with LLM. The tool is not the problem here, the user is. Inexperienced people think they can just develop something in a weekend and indeed, it looks good on the surface. But this leads then to the thing you describe. But if you carefully implement features including all tests, nothing is wrong with vibe coding. And people should start accepting this fact instead of fighting it based on bad examples.