I'm not. For all I know, he may be juggling 100,000 different terrariums.
What I do know is that the RE depiction is incredibly unsatisfying. Let me explain...
1. Human beings are not allowed to stand upright on level ground but instead consigned to standing on the side or even underside of a sphere. I'm sorry but even if gravity makes us stick, that sounds uncomfortable.
2. Not only that, as a fan of being in one place, thanks to frequent moves during childhood, the idea that the Earth constants rotates and orbits is not only depressing, but gives me motion sickness by proxy.
3. The nearest planet is impossibly distant, and we have yet to find one with life on it. Endless wandering is what the Jewish people did. Ask them how that idea looks.
4. Speaking of Judeo-Christian tradition, outer space? Sounds an awful lot like this.
Then the king said to the servants, ‘Bind him hand and foot, and throw him into the outer darkness; in that place there will be weeping and gnashing of teeth.’
Indeed the depictions of outer space are incredibly depressing. They are apparently not able to wash or shower or use the bathroom properly.
In comparison, flying through some kind of barrier to another part of a larger firmament, you set down, there is normal air and water, you can poop, there are just Venusians or Martians there, and they more or less look like us with some minor differences.
5. The incredibly cold lifeless and uncaring universe depicted, that literally all life could end on this Earth if we happen to orbit the galaxy in such a way that we cross into the path of a star. Why hasn't this happened in millions of years? Probably because it can't happen. Earth is not orbiting, rotating, or tilting. The stars move around Earth.
There could be infinite area, but what doesn't seem right is a big empty universe mostly devoid of life. Hell, you can go out on a road trip and see that trees and grass seems to outnumber lifeless desert or bare mountains. The reason I pick nine areas is that this is established as our solar system.
There's also this model. Midgard being Earth, I'd say there's more than enough breathing space, and probably multiple Yggdrasils.
The Norse are badasses.