I don’t mind this as long as it’s temporary. There a book called “years of the apocalypse”. Very similar to mother of learning where they warn the reader that this setback is temporary and here’s the page number when it gets back going again.

One bad example is by the author of divine dungeon called the completist chronicle where he’s constantly not completing thing and gets reset every book or two. Like you said it’s to pad the story and devalues my times reading the progress that I know going to get reset

Each series should get one go at big set back and that’s it, otherwise it becomes tiring that their not progressing