I don’t think any of that stuff would have been immediately apparent to me either, it’s just hard to parse the rulebook sometimes, and the official wording. In TripleA you get a clear visual, like the first time you see Karelia or Caucasus or Soviet Far East turn from Gray/Yellow to Green! and it opens up this whole other world of the endgame, post Moscow collapse. Or if you’ve ever played long enough post KGF to see Japan take control of Italy, or long enough in KJF to see Germany take Manchuria. Then it starts to make a lot of sense in the 2v2 match up, why sometimes it makes sense NOT to take certain territories from a vanquished enemy. Similarly if you still have Russian ground units alive, who could conceivably retake a place like Caucasus, but there’s just no point if the Germans already hold Moscow, better to leave it alone for UK or America to take, so they can collect the income for it 🙂
The stuff is kind of weird to be honest, and can definitely change the situation on the ground, once capitals start falling.