Earlier quoted context omitted.
Why would anyone want to block, rather than mute? I suppose it's more 'honest' in some ways but the implementation as described almost feels designed to create drama. Is it easier to block or to mute? Which one is the de facto default in the UI?
Mute is self-curation by the author. Whereas Block is the closest thing to moderation for ones' followers. People have different thresholds for both actions.
It seems most people who use twitter don't understand this though.