Monster Hunter released December 10. Only half of the 2 million LTD were sold in Japan in 2011.
Mario Kart 7 on 3DS released December 4. Only 1/3 of of the 3 million LTD were sold in Japan in 2011.
Super Mario 3D Land released November 13. Only half of the 2 million LTD were sold in Japan in 2011.
So, if your argument was that Switch software in 2017 outsold 3DS software in 2011 implies a higher attach rate in Japan, I'd say it's more likely because the big mega titles were released at the very end of 2011 for the 3DS, whereas for the Switch it had its mega titles release throughout the whole year.
I'd like to see software comparison numbers on the Switch's first quarter of 2018 compared with the 3DS' first quarter of 2012. I expect the latter to absolutely blow the former out of the water.







