I don't begrudge Cosmic or anything, it's just not what I want. I'm glad it exists.

KDE 4 was the TRULY bad release, if I recall correctly. It was a massive change from 3 and reduction in features and stability. I actually noped back over to Windows for a while as a result. I remember 5 being a welcome return to form comparatively.

EDIT: From the wikipedia Article on KDE4, oof:

KDE 4.0 was released in January 2008. Linux.com described the reaction from users as a "revolt", writing that the backlash KDE 4.0 received was on a scale that was unprecedented for a FOSS project. Although it was a developer's release, several distributions made the KDE 4.0 desktop environment available to their users without specifying that it was an experimental option. openSUSE released a more polished KDE 4 option while other distributions "released packages that simply [didn't] work," according to project leader Aaron Seigo. As a result, many users complained about the loss of features and stability. A number of KDE developers, including project leader Aaron Seigo, were targeted for abuse by outlets like Linux Hater's Blog. Several KDE developers stepped back from the public scrutiny.[36]