[Kaius]

Exactly! There is a phrase in Thing Explainer where Randall is trying to say that a part of a space shuttle or something is made in Japan, instead of using 'Japan' he has to say something like "the land where the sun comes up" or close to it (I don't think he could use 'rising' but may be not be recalling correctly). It breaks down as soon as you try to convey something beyond base level understanding.

So yes, it sounds like using the most common 1K words would aid readability but you probably need to raise that to 2.5K or more. Low enough to avoid the use of complex words while also freeing the author from awkward phrasings.