I'm not sure if this outweighs the different reading experience, but that ability makes for something which is fundamentally different, rather than being a strictly worse version of a blog.
Agree, it's interactive. It's built to involve you and the audience in a very democratically equal way. Everything is a conversation instead of a soliloquy (blog).
HN also offers the same conversational interaction (with much better moderation). It's what pulls us in. It's interesting to see that every comment on HN, for example, is also an original, stand-alone post where you too become an author on this system : https://news.ycombinator.com/item?id=34252904 : it's very balanced for all participants.
It's hard not to get pulled in by this conversational aspect on Twitter (and similar) when you have (1) a voice and (2) it's generally built to be equal within the system (if we gloss over some issues created by the number of followers that give some users a much greater voice). There's a sense of ownership that comes with this.