Too bad the books universe is absolutely the worst.
There was no reason at all it to exist. Nothing useful in the economy. There was no basic trade going on. Only spice trade.
And the only reason for the spice was to supply the Navigators...
The only reason for the Navigators was the spice trade...
And since only the super wealthy could afford the spice for medical use...
Why bother?
And yes, I have read the series. It did take a very long time to realize it was totally stupid.