Neither. It's just that different things needs different design approaches. An online store has nothing in common with a presentation site. Just like a real sto

Neither. It's just that different things needs different design approaches. An online store has nothing in common with a presentation site. Just like a real store needs shelves, an online store needs to group the information somehow. Sidebars aren't the only way to group information. I bet Apple will redesign its online store in the near future.