Alright, so firstly I gotta dig into Azuma's work myself...only skimmed Otaku and basically just got the cultural context for that work, although I've gotten a sort of trickling understanding of the "database mentality" and been able to understand what's commonly referred to as "deconstructions" of genre works as critiques/complications of that database mentality.
I do very much agree with the usefulness/necessity of multiple narratives/"industries" of culture vs. a monolithic narrative/cultural production, but I've also come from a wariness of neatly attributing that tension to a mapped dichotomy of modernism vs. postmodernism (modernism seems less like a singular vision and more like a series of competing visions and futureshocks, whereas postmodernism often seems to accept -uncritically- a nihilistic assumption that beneath the paper mache of meaning and the real there is nothing that exists, and through that meaninglessness gets caught up in its own doubts and false equivalences and ends up treading water). Of course, this all is from different uses of modernism and postmodernism than what are being deployed here.
Out of curiosity (and a bit of vanity), I wonder what you'd have to say about my own entry into the essay jam? Do you think there was anything in there that is useful to what you're outlining here? Or do you see them as two separate conversations?
All this to say, I like it, I like how you pulled it off, I like the aesthetics of what you pull off here, and find it a very interesting topic! :)