I used to leave 3D effects fully on for 70% of time before I got my Japanese New 3DS. After experimenting the head-tracking 3D adjustment function for a bit, I've found it much more difficult to come back on any of my older 3DS models, to the point I only use 3D effects for 10% of time.
Also, the vast majority of the games didn't needed 3D effects anyway, so it wasn't worth for me to leave the 3D on all the time. It would also make Super Smash Bros. for 3DS more annoying to play because its fast-paced antics cause me to unintentionally move my 3DS and render the upper screen less view-able.
Also, the vast majority of the games didn't needed 3D effects anyway, so it wasn't worth for me to leave the 3D on all the time. It would also make Super Smash Bros. for 3DS more annoying to play because its fast-paced antics cause me to unintentionally move my 3DS and render the upper screen less view-able.