I found some answers to my question on Capcoms own forum, which sound like I actually figured it out properly:
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What kid new to the series isn't gonna feel cheated after playing one, and then realizing the other is basically the exact same?
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Whos crazy idea of basically putting the same game together? Capcom or Sony?
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You've gotta be kidding me. Unite and Freedom 2? I feel bad for the sucker who is excited about picking up to get 2 different Monster Hunter experiances.
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But yeah, MHFU and MHF2 in the same package is a really retarded move. It doesn't even make sense. MHF1 would have at least given you a different main town and "story".
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It exists to make money off of dumb people. By dumb, I of course mean people unaware of the fact both games are basically copies of one another, or people who have a MH collection going.
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This tells us is that the people in Capcom's marketing dept don't actually know about (let alone play) the games their company makes. It would have made more sense to just put TWO copies of MHFU in the pack so you could give the other copy to someone who could then hunt with you!
And so on... Oh my god...