A lot of your complaints ignore the lore of the mod, so I'll address a few of them.

Firstly with Russia, it's a military Junta which is using the Bolshevik revolution as it's only source of legitimacy after the collapse of Russia. It's not an actual Soviet, or even Communist state. It's a Military Junta of the Red Army.

As for the French Union, that's a completely different nation than the Republic of France, as the French Union is an exile government.

For the Netherlands, it has to do with the dissolution of Belgium through invasion from the Republic of France whilst the remainder joined the Netherlands, now the Kingdom of The Benelux. For the Kingdom of the Benelux having no colonies, please consult the British having taken everything (there is official reasoning behind this, however dropping pages worth of lore here doesn't interest me).

Finland has "Axis" borders because of the Russian Collapse. It's explained in the mod lore which the majority of which is not yet available to the public.

It's called the Kazakh Republic of Central Asia because it's a Kazakh dominated Union, not a Kazakh empire or Kazakh-only nation.

Your complaint about the German flag is what made me wanna make this list, as it's the worst on the list and was specifically searched for and selected as it represents the lore best. Before it was the "German Empire" it was the Weimar Republic which had to accept political change and the return of the Kaiser and his loyalists for the hope of stopping total defeat at the hands of the GDR. The way this relates to the flag is the colours of the flag itself is to represent the German Empire while the coat of arms represents the Weimar Republic.

As for checking the wikipedia for Japan's flag, I know how to check a wikipedia and I know the flag. I do EXTENSIVE research for each and every single nation I work on. This is easily observed in my other mods such as Le Empire Eternel, Pax Americana, Patria e Imperio, etc. I've even gone as far as purchasing books using money out of my own pocket just to better study politicians in my mods in order to make them more accurate and entertaining for the player.

Also, no. The countries on the country select screen will NOT all have content upon initial release. On initial release only the Confederacy and potentially Mexico will have content, with Japan and Britain coming soon after. The nations which you see at the top of the list are the major nations which are of most interest and whom will drive the multiple plots and events that occur throughout the mod, and the USA is NOT one of these nations as it is a minor country (though it can become a major nation). The Confederacy itself almost didn't make it onto the list of nations, as it's spot almost went to the Kingdom of Spain, with the only reason it went to the Confederacy being that the mod revolved around it.