I agree! The HP series is set at just about the latest possible date where it actually makes sense for it to be, IMO. Even by the early 2000s I think the "magic" of Muggle tech was starting to outpace wizard magic, which is presented as relatively stagnant; it doesn't seem that there are huge leaps of magical innovation each decade. The limitations of magic also seem very arbitrary and influenced by the time period in which JKR was first writing. Why should the kids be looking for information by manually paging through book after book? Why not some form of magical search engine that could bring the wizarding world its own Information Age? But the revolutionary potential of that was probably not even on her radar in the early 90s.