It's hard to know whether it's an author or a publisher that's dragging out a series, and if it's the author why they're doing it (money, attention, lack of ideas for a new series or after story, etc.)
Failure Frame drove me away when it reached a perfect point to end the main story arc, but then the author threw in a reset to drag it out (forever?).
I'd much rather read the Skeleton Knight or Realist Hero approach where the author finishes their arc then starts something new with the story. Otherwise it turns into kid cartoon shows where the bad guy escapes every episode so they can come back next week to sell new toys.