You get the other path for $20, right? Half off? So, even if the two games are more like 1.5 games, aren't you only paying 1.5x the price? Isn't that still a fair deal? I'm missing something on this "splitting one game into two" stuff.
The truth is, they shouldn't be two separate titles, period. It's just a stupid marketing scheme to make people think they're getting MORE for their money when it's nothing like that.
Who made you the king of determining what's enough content and what isn't? I'd say if you're not happy with the whole thing then just buy 1 of them and treat it like it's not a choice when you get to chapter 6.
Or if you think that that's not enough content to justify $40 then don't buy it, but don't try to tell us that it's not enough. Fates has the same number of chapters as Awakening. (I played through Awakening twice using a harder difficulty the second time and put about 70 hours into it) Awakening more than justified the $70 price tag for me. As for Fates, my daughter wanted to play Birthright and so I bought it and I've been going through it with her (she's only 6), but I wanted to do conquest so I started a new file and when I got to chapter 6 I paid the $20. I feel like I'm getting 2 very different, but related games so I feel like I've gotten my money's worth. However, some people don't want that much Fire Emblem and just 1 version will make more sense for them. Personally, I'd never buy both versions of a Pokemon game because it doesn't make sense for me, but I don't rip on others that do and I don't try and tell Nintendo/Game Freak that they are money hungry scoundrels for making 2 versions of the game to try to sell more copies.