Why did Nintendo chose not to implement a system wide achievement system? Stubborn or missed the boat?

[Jizz_Beard_thePirate]

Isn't their sticker thing essentially an achievement system? Heck, I say its better than achievements because you can use it on miiverse... I will say that its only downside is that u have to get into the game in order to access the stickers so if you didn't have to do that, I would take stickers over achievements anyday