Maybe. I've got enough uninstaller logic wrong in my day to believe it possible that a failure to switch off all your daemons and delete them is just sloppy software engineering on a piece of the system that isn't considered critical path by product managers.

After all, users never want to uninstall our software, right? That implies they don't love our product. And of course they love our product. ;)

It's not that uninstalling isn't an important feature. It's just that at crunch time, project managers will pull people off polishing the uninstaller to put them on that virtual green-screen feature 10 out of 10 times.