Nah, it's not stupid at all, especially when you consider the fact that Tales of Vesperia, along with several other JRPGs early into this console generation, were subsidized by Microsoft for the purposes of getting a foothold in Japan. HD game development was non-existent in Japan at the time, and PS3 dev tools were a joke. Microsoft on the other hand, had easy to use tools and had moneyhats in hand to get whatever exclusivity they could get, temporary or otherwise. For all intents and purposes, Tales of Vesperia was a Microsoft funded game. It was win-win for Japanese developers wanting to gain entry into next-gen console development.
If anyone should be annoyed, it's 360 owners since content was intentionally withheld from the 360 release of Vesperia to make the year later PS3 version better, as evidenced by the game's code and even dialogue referencing a character that wasn't in the game that was unveiled as "new" for the PS3 release. Not that I really am upset BTW, since Patty is just a stupid loli. But this hysteria over Vesperia (lol) is pretty amusing.