The original 3DS came out 6 years ago. We've shifted more on the digital front since then. If the expectation is to buy a new card with the console... that's just another expense. It's quickly adding up. I just thought it was an odd launch problem to have.. .maybe something you'd see mid/end life as bigger games come out.
My 3DS Mario game would have fit fine on the card it came with, but of course I uppoed the size. That was an option though, not a requirement.