On the other hand, in Dune universe we see all that weird machinery used by a very unusual part of the society, the top 0.01%; and even they're not a product of

On the other hand, in Dune universe we see all that weird machinery used by a very unusual part of the society, the top 0.01%; and even they're not a product of the societies they live in but an import from the partially shunned Ixian community - so we can presume that the ordinary people don't make or use machines nearly as much. E.g. there are some instances of complex electronics, but it seems like most planets e.g. Caladan would have near-zero electronic industry, it doesn't seem that this would be a career option for some random inhabitant of Atreides' home planet to just decide to study electronics and make them.