Aldarion
Archmage
Aye, they don't need a lot of defense, but it's not an attack on them to say that there might be some missed potential if you don't consider alternatives.
Agreed, but on the other hand, you should consider realities of the society... for example, last episodes of A Game of Thrones? Nothing there makes any sense at all. Even George Martin himself created a system that is more modern than medieval in its nature.
And if you want to examine various different options, you can easily have them all within the context of a feudal monarchy...
I suppose I should add, I would not see much need to investigate the form of government further than 'there was a king' unless the story was about the politics, and I was supposed to be rooting for or against the king. Did it matter to Frodo how the elves organized? Not really. Why delve into it deeper unless the story was about changing their system.
Author should delve deeper when thinking about it: even when you are not writing about politics of a society, they can still impact the story. Look at Lord of the Rings: it is not a political story, yet politics affect every aspect of it.