Perhaps on a relative scale "most" fiction doesn't carry any sort of deeper meaning, but if you look at things like "Hugo or Nebula Award nominees" (to pluck out the SF/F genre as a category), I'd say that almost every single one of them, going back all those decades, has something more to say than just their straightforward text.
And unless reading is your day job or only hobby, that's a massive, massive corpus of interesting text. (In just one genre! There are more genres!) So on an absolute scale, there is so much fiction to read with more-than-surface-level meaning that I personally just don't understand why anyone would have the least interest in reading AI slop.
(I also don't have any real interest in most Kindle Unlimited works, probably for similar reasons. Though I am quite certain there are diamonds there, I've just not had particularly much time for/good luck at finding them.)
