Me playing Pillars of Eternity: "Yes all of these fanstastical scenarios and made up words make sense."
Me playing Pentiment: "These old words written in a language I speak, with context, and that can easily be looked up are inscrutable."
Suspension of disbelief, or some form of "understood helplessness" maybe? "These words have a meaning and context I cannot possibly know unless the author tells me, so I won't stress about it." vs. "These words have a meaning and context that exists in my reality, and I don't know any of it. But I could..."