I've been trying to use my new Debian+KDE with only graphical interface (using discover to install & update stuff). As to see how it goes, because seeing how it goes helps recommending Linux to new ppl.
This resulted in my root partition (of recommended size) getting full because Discover doesn't mention that it doesn't delete the old kernel versions. It's good it doesn't delete them without asking, but it should recommend doing so at some point.