Hey, if Scrum is working for some team, I would be the last person to ask them to change it. I know how much I hate it when I have a workflow that is succeeding and then management arbitrarily makes me switch to Scrum. So I would not want to do that to people who are doing great with Scrum.
The reason I feel the need to deeply question it though, is that most managers don't express the attitude you expressed. Most often they see a workflow as something they need to enforce unilaterally, and that it should function to commoditize the underlying teams.
Given that this is how it's practiced almost everywhere, it's fair to ask why is that? Is there anything intrinsic to Scrum that makes that mistake easier? Or at least, is there something Scrum lacks which would make that mistake harder?
And then to finally ask if someone is advocating for everyone to be happy switching to Scrum, and advocating that every possible problem with Scrum is not Scrum's fault but always just the misapplication of Scrum (like they are interpreting a religious text or something), then I think it's fair for me to say, "prove it" and ask for evidence that the extra operational overhead of Scrum is empirically shown to be cost-effective.