KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
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Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
Some devices provide a hardware level interface for it. It is the case for my ThinkPad T14s and the limiting persists even when changing operating systems.
Some other devices don't, and the limiting only works while the OS is running. That's how my previous laptop from ASUS was.
not sure, but it's probably just an interface to an embedded battery controller and this controller is the one actually determining how/when the battery must charge, so it doesn't need constant input from the CPU.