This also, by the way, extends to questions with the science-based tag.
I just posted an answer to Is a spherical core and magnetic field possible in Cube world, the (as of now) most recent of the questions on cube-shaped planets. I had been busy during the other cube-shaped-planet questions, and so hadn't picked up on the fact that it was assumed that a little magic had to be invoked - otherwise, as I (and jamesqf, independently and long before me) - pointed out, such a planet could not rotate and stay in the shape of a cube.
Part of the reason I had been clueless to this was that all three of the questions used the reality-check tag. Normally, I would answer a question like this using only science, logic, and things that we know to be true - in other words, without magic.
The premise of the questions, though, appear to rest on what may be an extremely trivial or may be an extremely important use of magic. I'm asking this question, though, for future questions - so don't take these questions as the optimal examples.
I'd support the latter proposition, and deal with it on a case-by-case basis, if there even is a case like this.