they have to compete with other ps4 games.Regular Americans will be playing their games on the Xbox One. There's no reason for American devs to make the version that their friends will play inferior. What incentive would devs have to spend more time and money to maximize the PS4 version?
I seriously hope I'm wrong, but this is honestly what I expect.
if a developer is making a game on both ps4 and xb1, they are wanting to compete on both platforms. they're going to try their hardest to make each version look and play as best they can, because those games have to compete with other games on respective platforms. they wouldn't willingly make one version shittier than it could be unless there are time/cost restraints.