I can see the logic behind the narrow presentation. If most people use this on pocket computers, the writing will likely be tailored to that format e.g. with ge

I can see the logic behind the narrow presentation. If most people use this on pocket computers, the writing will likely be tailored to that format e.g. with generally shorter paragraphs so as not to tower. Keeping the presentation consistent might help with readability. For an example of what Twitter might be trying to avoid, look no further than this website, which has driven me to inject `.comment { max-width: 70ch; }`, among other things.