You can always use a PC.
That's hardly of any help. Many people want higher spawn rates and larger worlds on mobile. And there's barely any feasible reason to not give them to us.
Their logic for decreasing the spawn rate was that it would makes things "friendlier for the mobile crowd". Now that seems a little insulting to me, because it shows they're insinuating we don't have the skill to handle ourselves in-game. As though they're forgetting they've already nerfed the stats of every mob and boss in the game to make them trivial at best.
If the issue is on a performance level, I should note that this is a 2D sandbox game with opengl shaders. The game itself isn't that resource hungry, in fact, that "requirement of 512 MB of RAM" makes it seem like they think they're pushing us something much larger than they really are, because in my experience, the app never uses more than 230 MB at the most.
Of course there are still some older devices out there that wouldn't be able to handle these things if they were implemented, but those are getting rarer and rarer. We're in a time and age when tablets have quad-core processors at high frequencies, dedicated GPUs, and multiple gigs of RAM. What's more, is these devices aren't as expensive as you'd think. What's the point in supporting older low end devices when those are so uncommon now, and the vast majority of what is out there currently can handle much more? At the very least, they need to give options for those of us on higher end devices.
As for the world sizes, they haven't given reasons on this, so my guess is again because of performance concerns. But for that, you can just refer to my above rant.
Based on the poor design decisions, lack of intuitive and outright horrid controls, poor functionality, and the repeated heavily broken updates that make it seem like they're not even testing things, I'm beginning to grow a strong opinion that 505 and Codeglue are not the right fit for Terraria, especially seeing as how
Codeglue has only worked on a few very very low key things.