Could you clarify just how big the worlds are? I'm assuming if there's no option for Small or Medium, that it's Small worlds only? ...the worlds we end up getting are likely smaller than the 'Small' worlds of other console versions. I mean, why else can't we choose between Small or Medium?
... and you say the RAM is the issue here. Well, did you know that the New 3DS has twice as much RAM as a 3DS? You could potentially make the game twice as good. Essentially, you'd rather dumb the game down to make a bit of cash rather than deliver the best experience possible. Fair enough, you're a business after all.
I'm not trying to be awkward. Please see it from my point of view. I've been wanting this game on 3DS for years. It's finally announced, years too late, on the out dated model of 3DS, with an outdated version of the game, with huge limitations to the gameplay. Massive disappointment. :/