Sorry, I don't get your points. Reporting random crashes or arbitrary issues you encountered and expecting the developers to magically fix those - are you kidding?
As you don't even provide any substantial details like used graphics card and driver, and any clear steps to reproduce those issues reliably, this pretty much just a waste of time IMHO.
FWIW, I'm using KDE since nearly ten years now, and it never froze hard for me. plasma may have crashed, but it always restartet itself when it did. This was the same on several distros.
If there were hard freezes, those were usually related to hardware issues, like ACPI problems, bad wireless vendor drivers being used via ndiswrapper/driverloader etc.
If you want to complain further about KDE, please do so upstream:
https://forum.kde.org/Good luck with that.