>The reader is free to experience the story however they want, of course.

I think this is the crux of the matter. If an artist creates a work of art with one intention, but the majority of the audience receives it in a different manner -- one that is highly poignant to them -- at some point it does not matter as much socially what the author intended. What is received has far more impact.

Like it or not, Eva was the first effective introduction that many people have with important philosophical concepts. It gets the audience to engage with existential questions in a meaningful way, even if it does not do so in a manner as intellectually rigorous or with all of the historical attributions an academic may find important. To say that the series has no relationship to philosophy is simply very closed-minded.