Why has Nintendo not put in a achievement system in the 3DS/Wii and has the HD twins missed a golden opportunity?

[Zlejedi]

Well Sony should have implemented trophies from day 1 or at least force everyone releasing games in 2008 to patch support later.

I'm still pissed off VC1 didn't get trophies.

As for Wii-U I hope Nintendo get's smarter and implements them.