Along with some of the other things mentioned, mostly including the extremely low power hardware, the app is also extremely early in development. The art will certainly undergo many reworks, so they probably dont want to invest heavily in it yet. Plus the whole vision is extremely technically complicated, with significant challenges to it, while the art is something that can be focused on later.
Imo the biggest thing is that the current stage of the platform is barely even a beta, but is being pitched very officially.
Unrelated to the above, I think their whole vision is incredibly bland and boring, which is, above all else, what will be the biggest downfall.