I prefer the earlier bumpers and body style myself, but, swapping the bumpers to the earlier style requires A LOT more work than just tucking the later bumpers in. Whole new front clip, new tail panel, modifications to the frame rails and cross members depending on the year, etc.
There are a few members here that have done a really good job of tucking the later bumpers (as shown in the thread I linked), and that's far less invasive than what amounts to cloning an earlier year car but still makes a pretty big visual difference.