Hearts of Iron IV's resource distribution problem

Okay, I'm not gonna pretend to be an all-knowing historian but the difference between the resources in the imperial core and the resources everywhere else is so baffling to me. One could argue that the imperial core has all those resources because of the colonies, but the colonies in the game barely have anything. the UK could lose all of their colonies in Africa and still produce a metric ton of steel.

Take a look at Germany:

As you can see Germany has a shit ton of steel and aluminum, two very important resources, and a little bit of oil and chromium.

Now let's check Africa:

This is only one part of Africa since resource icons don't appear when you are very far away, but you get the point; Africa barely has resources except for some isolated cases such as the chromium in the southern part and some steel in the north-west.

Maybe I'm wrong, and please tell me if I am, but wasn't the reason the imperial powers colonized half the world to steal their natural resources?

And even gameplay-wise it would make sense to move resources to Africa, since in my opinion Africa is barely worth fighting for. You lose a shit ton of manpower and equipment to attrition in an offensive because there is no supply anywhere, and what do you get? 12 rubber?

I calculated all of the base resources in both Africa and Germany.

Africa has 66 steel, 0 aluminum, 250 chromium, 36 rubber and 1 oil.

Germany has 247 steel, 83 aluminum, 3 chromium, 0 rubber and 2 oil.

Apart of chromium and rubber the difference is abysmal. And remember we are comparing 1 (one) country to an entire continent.

What are your thoughts?