Future expansions.

If there are also several developers working on a single game within the series.

I think, in this case, it was justified. Although it will be difficult for the new developers to refine someone else's game, of course.
P.S. Maybe Nival will be brought back; they seemed to have finished their "Allods" games. :)
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Well, here we have what we have. I even heard a rumor that Black Hole ceased to exist.

This is what is written in the link provided by Adagio.