Frustration with government portrayal in speculative fiction

I'm feeling a deep dissatisfaction with all the science fiction/speculative fiction I've read in the past that deals with future governments. For the most part, it seems like stories always fall into the trappings of liberal paradigms that have defined electoral republics for the past 250 years. It seems that a lot of authors are incapable of imagining things much different than the American constitution, 20th century fascist dictatorships, or some uninspired medieval monarchy. Even stories which attempt to portray government succession just seem to fall into the trappings of Aristotle and Polybius's dumb nihilistic analcyclosis theory. I find this very frustrating. Are dictatorships where the human ruler is replaced by AI the most imaginative thing speculative fiction authors can come up with?

The best and most intelligent sci-fi authors (with the exception of Frank Herbert) don't actually talk about future governments in much detail. That's the most boring part of the future. The politics of the Dune universe are actually quite complicated and I don't think it makes sense to compare it to a "uninspired medieval monarchy", nor would I describe the series as having any thesis of cyclic government succession.

Good scifi usually focuses on a relatively small number of interesting points and tries to consider their implications and effects, and most of the time these points aren't especially governmental. Many books even acknowledging government more than absolutely needed would bog them down, right ? Books like Solaris have no need for government, so its safe just to assume 'system basically like what we have'. Least confusion for the reader, least distraction from the plot. Or take Herbert's Under Pressure, the whole point is the relations and management of men in a confined space on a dangerous mission, detailing the government is offtopic. Some books like Dune and Starship Troopers are significantly political scifi where an interesting governmental system is the point under consideration. Other books like Minority Report are a little less broad but still about governance. What really ticks me off is using weird governments in establishing a setting and then not well considering how they work. It can be distracting without adding much to the story but undermines the whole book's credibility. If its not central best to just leave it out imho.