I have been reading and reviewing THE BIG BOOK OF SCIENCE FICTION stories from around 1900. I have previously read quite a lot of modern SF (for example, the fiction in INTERZONE over the last few years, my real-time reviews being linked here: https://conezero.wordpress.com/interzone/) and I suggest that SF has not changed radically in quality, style and subject-matter since around 1900 when E.M. Forster first featured the Internet in ‘The Machine Stops’. This is a positive and unsurprising thing to say, I feel, bearing in mind the nature of SF. Modernism is ever with us in every age, and modernism can hardly change, especially speculative modernism, didactic trends of cultural or scientific campaigns notwithstanding.
(My BiG BOOK OF SF review started here: https://dflewisreviews.wordpress.com/2016/07/19/the-big-book-of-science-fiction/)