I like the feature on Windows that lets you freely choose the mouse cursor color. I got used to having different cursor colors for different accounts (private, work, DJ). Also, I like my desktop to have some specks of vivid color, and the mouse pointer is a good choice for that.
In KDE, this is only possible by installing a different cursor theme. Unfortunately, most themes only have one or two colors: black and white. In fact, I haven’t found any that are purple or light green. And plenty other colorful ones are old and only feature low resolution images, making the cursor tiny on my laptop’s 4K screen.
I guess to support such a feature, KDE first would have to support vector-based mouse cursors? Is there even a standard for that? However, that would greatly reduce the effort for creating different sized bitmaps, and at the same time allow for insanely large mouse cursors (accessibility!).