I think at some point, they had to make a decision about the level of granularity they wanted to present, and chose to go with nations.
Consider the United States as an example. If we were to map the states of the US in a similar way, the coastal states would be inflated considerably from their actual size while the intermountain west (basically the Mountain Time zone) would shrink down to pinpricks. The map might be recognizable to someone familiar with the states of the US, but might as well be an inkblot to a Ugandan*.
Taking the granularity a step further, to the level of counties would make my own state, Oklahoma, nearly unrecognizable even to longtime residents. Half of the population lives in just 3 of the 77 counties.
The tl;dr (too late, I know): I'm willing to let the map-makers lump Alaska in with the whole of the US, rather than treat it as a separate entity.
*Ugandan was an arbitrary choice for someone who lives half a world away and has no need to be familiar with US internal boundaries.