For ease of normie use. Nostr doesn't GAF about data integrity. Nice for tinkering, but a real pain for users.
Discussion
Fortunately, normie ease of use is not the problem Nostr is trying to solve. That comes later. Makes sense normie ease of use is the problem bluesky is focusing on, illustrated by their overwhelming centralization. One is novel, the other is a waste of time.
Society isn't being threatened by bad social media UX.