You may as well be saying that there are better options for producing readable text than HTML, because that's what Reader Mode is for. Yes, but entirely irrelevant. Reader Mode is for the reader to use, not for the writer to use. Liquid Mode is for the reader to use, not for the writer to use. See the parallel?
What the writer wants to present is structured layout based on design. Sometimes that's what the reader wants to see, other times not. That's why websites aren't all flat text and browsers have reader modes, not the other way around.