My fan broke after five? years of near 24/7 use. Customer support was very easy to reach. They sent me a new one after I sent some serial numbers as proof. They asked me then to break off a blade, and a picture of it so I didn't have to sent it back.
Well, if it can still be repaired but the producer doesn't want to bother and just sends a new fan, that's fine. That doesn't mean a repairable product should be destroyed and sent to a landfill just because it makes Noctua's logistics easier.
The point is, if the owner thinks it can be repaired, they shouldn’t call for a replacement in the first place. And indeed they wouldn’t get one, because they wouldn’t break the blade. So it’s completely under control of the owner.