The conservatism even extends to the adoption of technology. They make excuses about interference with electricity, but they could have moved to typewriters instead of quills, and they manage to move up to radios, but not television or video games. Arthur Weasley is viewed as nearly heretical for his interests in more modern technology.
It’s odd how insular that is when the magic folk consider themselves hiding among the modern culture, but so ardently resist even a basic understanding of what is around them. I mean even cultures that eschew the modern, like the Amish, are typically aware to some degree of what is outside their realm of participation.