It will probably come down to time and money rather than laziness, as utilising the extra power will likely add extra developmental time, which has a cost. Assuming the game already looks and runs well enough, I doubt they'd put in the extra work solely for one platform.
I can't see why that would be the case though. If anything, the fact there's more technical parity between the two now than there ever has been previously will mean that it's easier for them to turn on/off features or make changes for either version. Even more so if there's a PC version too, considering the sheer wealth of settings they usually need to accommodate a variety of systems.