[m0llusk]

Such offerings have discontinuities between tracks or beat matched transitions. These generated tracks are constructed to continue with the same themes and sounds as long as wanted. It may or may not be desirable, but it is different.

[XCSme]

Oh, this makes sense, I didn't really think of the transition as potentially being distracting or a cue to stop working.

I personally use a "relaxing music playlist/radio", the songs are pretty similar (meditation music), and I don't often notice the song changing, but I do often notice that suddenly I am listening to a completely different melody.