When reading Jane Austen you learn a fair bit about the English upper classes of that time period. What do you learn from Gundam?
Learning stuff is a weird primary motivator to read fiction.
(I’m not sure you learn as much as you think; I mean some context leaks through but Austin’s characters aren’t necessarily _that_ archetypical. If you want that you might be better with a social history.)
The many Gundam series are not a historical account obviously.
From what I gather - having never actually watched any - there are anti-war themes (IE armies are commanded by people who don't have to sacrifice, how that corrupts), sacrifice vs outcomes and more. It's a thematic experience rather than an education in robotics or history.
I like stompy robots. I have to yet to start on Gundam because I am hesitant as to where to start and which path to follow in watching it all and I know it would consume me once I start.
Maybe after Xmas, in my break, I'll "waste" some time with it.
You learn a lot about post-War Japan and the New Left. Just because a writer dresses their story up in futuristic or fantastical trappings does not mean that they aren't writing about their own cultural milieu. Tomino is explicit about this in the interviews compiled for the supplementary material in the Gundam Origin manga. They are a fantastic read (and the manga is a masterpiece).