In theory, hurry up spread offenses are designed to make up for having inferior talent. It's much harder to just line up and win one on one battles.
*Having inferior strength*
Oregon got good because they recruited smaller, faster guys, notably borrowing players from the Track & Field team. The spread/blur offense they ran was designed to avoid having their 180lb guys get slobberknocked by a 300lb guy.
But the saying about defenses winning championships proved true. Most of the Pac-12 teams have traditionally had somewhat lackluster defenses and have opted for flashy offense. That's changed in recent years, but for a long time Oregon made their path by just being the flashiest among flashy. Take the lack of Big XII defenses to an extreme degree.
It's also why whenever Mach-Speed Oregon would meet an SEC or Big Ten team in a bowl game, they'd struggle. They weren't used to lightning fast LBs who could plant you on your ass before a play developed. It was like watching that Jadeveon Clowney sack against Michigan. Pac-12 flashypants would never know what hit 'em.