https://www.ericsbinaryworld.com/2015/01/27/an-appeal-for-keeping-kde-activities/
As KDE 5 reaches 5.2 and many begin to debate its features (this is a small evolution on 4 compared to the difference between 3 and 4) there has been an ever-increasing assertion that Activities are pointless. (At least it appears that way to me) I wanted to share how I use Activities, why they make me more productive, and why they’re the biggest feature keeping me on KDE. So, I have lots of Activities: Main, Media, School, Photography, Video Games, Video Editing, Programming, and Reading. In its current implementation, each Activity must have the same number of virtual desktops; three in my case. In each activity I make use of different widgets. On nearly all of them are the brilliant folder view and application launcher widgets. These allow me to quickly see the folders relevant to the task at hand. In the case of the Multimedia activity, desktop 1, this is very useful for my workflow. Let’s look at that desktop: