I'm not sure I understand what habla.news is for. Why can't one just publish (send) a blog (a bunch of text) through a standard nostr client? How is a blog different to a post? Does habla offer something that snort or coracle or damus do not?
Discussion
It's better for structured and longer content. Blogs have better formatting, human readable permanent urls and you can share the publications anywhere. Doesn't really matter if that person is on nostr or not.
It's like Medium, just better. Nostr is like "digital media in a box" to me. We have notes like twitter, blogs like Medium or Hive, streaming like Twitch and probably soon VOD as well managed in some kinky way too.
I personally don't like long notes on standard nostr clients. That's why we have a place for longer notes. Also these long-form notes can be updated by the author whereas regular kind 1 posts can not.