It does kind of matter what shape of earth it is. If we live in a concave earth and have an octahedran magnet in the middle of it, it makes absolute sense that everything is a part of electromagnetic phenomens.

Im just saying it makes sense. There is a chance the sense is very twisted or that it all a joke, or everything is very complicated and im making it too simple.

Its all just a matter of a level of complication. Okham razor says that the least complicated answers are most usualy true.

But yes all of them are kind of viable, they just need an explanation why some things appear or is illogical.