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Screens as Applications (Sort of)
Screens of computers used to be simplified terminals or LED-based presentations of digits/letters (like old alarm clocks). That was a very prevalent limitation. There were ways to compensate for such a limitation.
With PARC et al it became common to place "windows" around a screen, sort of managing various aspects of an application or several applications in tandem (multi-tasking).
Screens, unlike storage devices, are not so expensive and modern flatscreens don't consume way too much energy (they also fall asleep on their own when idle).
Over the years I began assigning tasks to screens, or whole applications to screens. There are many advantages associated with that, as enthusiasts of tiling window managers would know.
In KDE, they came up with the concept of Activities. Not many people adopted that. I experimented with it many times over the years, but I never liked it. It didn't suit my needs at all.
More applications open at the same time can result in more distraction, even when focus is paramount. Partitioning tasks or applications across screens helps maintain focus (on just one screen at the time).
Sadly, in this commercialised world, many people try to tell us how to use the computer rather than ask us how we prefer to use it (or what works best for us). █
Image source: Harold Lloyd