Why aren’t there advanced computers in an advanced society?
Maybe they want the "good old days" that they read about when life was supposedly simpler. Maybe it goes further than avoiding advanced computers, to avoiding any useful computer, and is a status symbol to be seen as living the simple "off grid" type of life. Maybe starting up a space ship's flt drive and crashing into a planet, killing all on board, is seen as proof of avoiding advanced computers. Not desired, but spoken of with admiration.