i think hes saying that he doesnt want to buy stuff on his 3DS because if it breaks/gets stolen/something else bad happens, then all those games he bought are lost because they are tied to the system and not to some account that will let him redownload them on a new system.
Hes right to some degree, because nintendo has been really stupid with their download services. They have Club Nintendo, Nintendo Network, w/e the 3DS one is, why cant they keep track of what people buy and let them redownload on another system? Its the same situation on the Wii U. They had a whole generation to fix this issue since it was the same on the Wii and the DSi.