I don't see your point. I'm sure it would have been very interesting back in 15th century to investigate the impact of continued literacy among the populace and

I don't see your point. I'm sure it would have been very interesting back in 15th century to investigate the impact of continued literacy among the populace and its effect on various power structures: religious, economic, and political. Today we know the answer so obviously in hindsight it seems obvious and maybe trivial, but I don't think it would have been at all trivial back then to investigate the matter.