You are correct, of course, but in the case of a twitter thread, the author themselves has (perhaps begrudgingly) already broken their train of thought into bite-size pieces. In fact, the commenter you were responding to already did so and you chose to elide the back half of that point to make a quick rhetorical point, rather than engage with them. The twitter thread model has its benefits in this regard.
Yet with a tweet, you can see all the reactions to a given fragment in one place.
And you cannot see all of the reactions in one place, and instead have to click on every single post in the thread.