[DominikD]

Vector images are nothing like bitmap images. You can't take bucket fill and use it like you would in Paint. What you did, it seems, is you used a bucket fill on a group of objects, setting their fill to the same color.

For what it does, Inkscape is one of the very few usable, large open source tools. It has the same problems other OSS projects do (suboptimal UI being one) but it's not tool's fault you expected behavior that's at odds with vector graphics.