> Breaking it up allows each sentence to be reshared more easily, which seems like it has interesting possibilities.
That's not a result of the length restriction; it's how quoting works -- right here in this very comment, I've chosen to only "reshare" one sentence from your comment.
As for the interesting possiibilities that could arise from mixing and matching transcluded tweets: either the mixing and matching are going to be done manually by someone assembling a series of quotes (a process not unique to twitter) or it's going to be the result of whatever order they show up in your timeline -- I think the results of that could be interesting if it was a random process, or if there were any way to influence the order apart from whatever twitter thinks will maximize user engagement.