ND is important for those who do "authoritative writing" (for a lack of a better term); i.e., when you write with your real name, you do not want nonsense and disinformation associated with your name.
Ah, yeah, in the meanwhile I've also googled your nick and saw that you're in academics.
That makes a lot of sense. Thanks!
Yes, I think of it more in the context of photo and video integrity, but you can certainly imagine an unscrupulous individual rewriting something and changing the meaning. Of course, I doubt a license would stop that person.
Doesn't CC BY require to say what you changed?
If a person would ignore one part of a license, they may also ignore other parts.
... Then why would they care that it's ND?
Not really. You're supposed to attribute the original creator. And if I did make major changes/additions I'd find some way to flag that. But you don't have a Github-style change log.
Not really, but you can't just distribute a changed version as if it were original. That's just as illegal as if it were ND.