>It suggests someone is a little more comfortable with their own thoughts

Maybe. There’s been a significant backlash against popular fiction authors for writing in anything but the first person, single fixed POV recently which sort of suggests that readers don’t like having to deal with the interiority of multiple different characters. If they’re not comfortable with the bare minimum of cognitive dissonance are they really doing much thinking, or just letting the text wash over them as someone does while watching a YouTube video?