You're using specs as classification for tech. Efficiency is important. Just chasing the raw figures number is getting ridiculous. Look at all the Xbox One VS PS4 stuff that's going on.
Efficiency is also important for the company. Nintendo go with what Gunpei Yokoi & Nintendo called the "lateral thinking with withered technology" strategy. Going with older tech and using it in new, cost effective, ways. It's what they did with the GameBoy. If Nintendo went the way MS and Sony have been doing, they'd be bankrupt and dead now. Look at all the losses of the PS3 and Xbox 360. That level of loss-leading damaged the industry, and it's continuing, albeit to a lesser extent thanks to off-the-shelf parts in the PS4 and Xbox One.
Going this route also helps with the overly inflating budgets of game development these days. The budgets are getting higher and higher with less returns. Look how many developers folded last gen, and how many are commenting on increasing budgets this gen. We're bound to have loads more closures, mark my words.
Wii and Wii U are sort of counter to that, but developers ignore it because, at least in the west, they're following the "more power philosophy". To me, it seems like Nintendo are trying to stave off and redirect a coming crash in the industry.
But I digress, that's just how I see it.
http://www.nintendo.co.jp/ir/pdf/2014/140730_2e.pdf