I'd say it's completely irresponsible to not have such features, claiming it's about security, rather than implementing it behind a permission system that puts the end-user in charge.
It is implemented behind a permission system. KScreenshot works perfectly fine and so will most of the applications using PipeWire I guess, same that screen captures.
KDE is merely saying that some applications will have to be updated to use it so all of the current screenshot applications won't work out of the box.
No idea of why some commenters here are implying screenshots don't work in Wayland. It seems their knowledge is somehow stuck at the first proof of concept ten years ago.
I was talking in general. It's less about screenshots and screen recording, but more about drag-and-drop and global hotkeys like push-to-talk in Discord.
Screen recording like screen sharing works perfectly fine with PipeWire.
Global hotkeys are also supported perfectly fine. Applications just need to register with the compositor, which will transfer the key press to them. That's the feature working at it should. It prevents applications from hijacking keys when that's not what you want.
The issue is that Discord takes ages to ship anything on Linux and barely supports anything and the Linux community does it's best to keep supporting everything. Other plateformes would have just mandated the new way ages ago and be done with the transition by now.