Comment 5 for bug 50320

Bugs can be rejected for many reasons. Not just because what you said isn't factually correct. For instance some reported bugs are just the way Kubuntu (or KDE) have decided to do things, much like other distros may have chosen to do things differently; "won't fix" ie. this is a feature decision rather than a bug; not enough details etc.

I think your bug report was initially rejected on the grounds that in KDE you normally set file associations within konqueror. Which is a design decision. In Kubuntu you can still run kcontrol if you want to access the file associations that way, however System Settings is the configuration tool in Kubuntu. System Settings I think is much easier for people to use and features will continue to be added to it.