@VoltraTheLively  
It’s more to do with the fact that he said “edge of Equestria”.

and don’t forget the globe spike hoarded in secret of my excess

equestria is just one nation or continent of the world, brah.

Because flat maps mean flat worlds.

Wasn’t it established in Hearths Warming Eve that Equestria isn’t the name of the world, just the name of the region?