I don't know, in times when account suspensions and/or removals for political reasons seem progressively more frequent (and arbitrary), it doesn't seem like a great idea to entrust the longer writings to them as well... It seems wiser to maintain separate blogs.
100% agree with you, but as long as they have an API you can access, you can always syndicate your content to Twitter. Here's an example for my potato.horse site connected to https://twitter.com/yay_psd : https://github.com/paprikka/yay.psd/blob/main/data/twitter/p... Most of my users are come from the site and Reddit, but it's one of those things you just set up and forget, so it was worth the hassle.
Of course I imagine that in addition to the intent to expand outward control (and let's call it aggressive "moderation"? the infamous dangerous "unfettered conversations" come back to mind ;)) of content as an alternative to blogs, there is also the intent to offer it as an alternative to long threads, which to me, however, does not seem like a good idea as well, because it is known that the average reader is more likely to read in chunks rather than deal with long text (as others have already said). Not to mention that with threads you can reply point by point, to individual tweets, which as I see it is smoother and neater.
Maybe I'm biased (that's why I started out with "I don't know") but I see it as more of a political move than a functional one, that's all. And by the way, if one really doesn't want to think about censorial and narrative control intentions, in the least worst case scenario to me it looks like a push toward increasing the already troubling monopoly of a few giants on content, data, attention, etc.