Lucas didn't do the clones justice by treating them as nothing more than CGI cannon fodder in the prequel trilogy. An entire other team had to create more (and better) stories to explore the obvious moral dilemma of creating clone soldiers enslaved to the Republic's MIC.
I remember reading that George Lucas actually just straight up said that it's complete nonsense and Han's just trying to pull one over on them because a sleezy dirtbag who just lies and makes up bullshit for profit.
I remember the old EU explanation (before the prequels were released) was that the Clone Wars were a jedi civil war between the actual jedi, and literally just clones of themselves who were made to be evil or some shit. I think there was even a book with the plot "oh look there's another jedi that survived the Clone Wars, oh no plot twist they're actually the clone of that jedi and they're just evil because it's literally in their blood to be evil."
That, and the mediocre EU writers scrabbling for inspiration or connections to the canon stories, so they can just make up whatever bullshit story they want and be like "oh hey guys look, it's like the thing they said in the movie! Remember that? Please associate me with your enjoyment of the movie!"
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I liked that one as a kid. Couldn't really get into any of the others