This is one of the places I have found the relevant note [0].

It states the following:

    Some of the more obvious issues are listed below. If these issues are important to you, you should stay with KDE 3.5 (KDE 3.5.10 was released in August 2008) until KDE 4.2 is released (scheduled for release in January 2009) when most of these issues are scheduled to be resolved.

    It is possible that distributions will work around some of these issues before distributing to users.

Also, IIRC, KDE developers were openly saying that releases from 4.0 to 4.2 will be buggy, and things will stabilize in 4.2 and beyond.

[0]: https://community.kde.org/Schedules/Is_KDE_4.1_for_you%3F

▲ vanviegen 4 days ago | parent [-]

That's about 4.1. I think the developers either underestimated the amount of bugs an average user would run in to on the 4.0 release, or forgot to tell those responsible for communication about their concerns. The release caused a shit storm, hence the more careful expectation management around the 4.1 release.

That being said: I've been using KDE since the 1.x days, with only a short Ubuntu Unity-intermezzo around the 4.0 release. Most of that time, it's been great!

	▲	bayindirh 3 days ago \| parent [-]
		I remember seeing similar things before release of 4.0 in the social media, the bird site and other places. However I neither have the time, nor the desire to dig these places, yet alone logon to them. Of course my mind may be lying to me, as well. Anyway, these days are over and KDE is better than ever, so it’s only nitpicking over some trivia.