Then Again, you are just trolling. The first link is about an external kpackagekit application, i am not sure if that app is Apper or Muon. But since is a package manager issue, then is has to do more with the distro than anything else. KDE doesn't care about rpm or debs packages or updates since those are very distribution specific details that doesn't have to do with KDE. Or you want kde developers to hadle your distro specific package management system?
So instead of complaining with KDE about that very distribution specific and isolated issue, just fill a bug request to your distro, so they change the silly hourly update defaults in the corresponding kpackagekit app, to a weekly or monthly update schedule, and make sure that your distro supports delta packages.
About the second link... well if you forgot the password is not kwallet's fault
And the third link... common! if your driver doesn't works how can you connect to any wifi netwrok? what that has to do with kwallet? The first thing that kde ask you is if you want to use the kwallet system. Just say no if you don't want it! or just set a password once, dont just hit cancel
http://www.merriam-webster.com/dictionary/cancel
kdewallet is useful to store all my passwaord in one sigle master key password so i dont have to memorize each web service password. You can , however, use your browser for that matter too, but the broser doesn't handle my cofee shop,nor my home wifi nor university wifi passwords, so ...it gets short for that.
So, as you demostrated, all those issues are just distro related.
Something that i don't like are some KDE defaults, like some window effects or icons everywhere that makes KDE feel bloated. But at least i can spend 2 minutes fixings those . That possibility doesn't even exist in others DE wich make them very annyoing .