I'm not trying to single you out or anything, but...
Maybe the fact that Tatsumi Port Island never really clicked with me so I don't care about no longer getting to explore it has something to do with it (and as I've said in the past, if they make a P4P and give it this exact treatment, I probably will not play it because that, to me, would rip out a lot of the charm of Inaba), but this is the most petty argument I have ever read. We've spent years criticizing companies for lazily porting PS2 games to the PSP without taking the time to design it with the handheld in mind, and rightfully so. Even if you ignore the graphics not being as good on PSP or the lack of a second stick or any of the other technological differences between the two, there's a bigger divide between the two platforms: a handheld game should be a game designed to be played on a handheld. The fact that I can put it in sleep mode does not change the fact that the best handheld games are designed to be played in short bursts (but can also accommodate marathon sessions) and are as pick-up-and-playable as possible. For better or for worse (and believe me, I'm not sure it is for the better), Atlus went the extra mile and completely redesigned the game with the PSP in mind, and then some. And now you're criticizing them for not just putting the game as it was on consoles on PSP?
Guess what: if you want to play a console game, go play it on consoles and stop whining.