[Isamu]

It is a central feature to the Harry Potter universe that technology is overlooked, because magic. That is why everything looks rather antiquated on the surface, because all the advances are made in magic and nobody bothers with other stuff that is perceived to be less effective or important.

Almost every building is rather precariously built and even absurd in details, because there is no value put in structural engineering, you just magic it all together.

Why ever would they use the Internet? They all perceive their own culture to be superior, and all their advances are bound up in magic.