They don't want a retro look at all. They simply want all Nike team's jerseys to be instantly recognisable as Nike. They started that trend back in 2003, when every Nike shirt had a weird 'anti-sweat' part at the bottom.
But still, the reason why Nike asked us is because they want all their striped teams (Barcelona, Atletico) to have this new design - thus making the shirts instantly recognisable (spelling?) as Nike.