There are several ways in which it's bad. Forcing all the work to fit into sprints, for instance. What if the natural way to divide the work results in some ch

There are several ways in which it's bad. Forcing all the work to fit into sprints, for instance. What if the natural way to divide the work results in some chunks that probably don't fit? Normally you'd just do them and it's be fine, but "we're doing Scrum" so now they have to be divided further and the parts have to be developed separately, even if that makes no sense. Also Scrum assumes things -- that the product owner is very competent, that dev teams are self managing, that the business is interested in updates in the same frequency as the sprint -- that aren't necessarily true. And everything that goes wrong is blamed on Scrum not being done exactly to the letter. So nothing else is fixed and everybody is more and more focused on doing Scrum ceremonies precisely right even if that was never their intention.