The issue isn't getting -20RR to overcome war exhaustion, it's overcoming the +RR from "occupied" malus which ticks up over time and, as far as I have seen, has no limit.
I've entertained the thought of a world occupation idea before (especially in EU3 where you could massively reduce the supply of goods and make crazy money from large scale occupations) but the "occupied" malus need to be broken somehow.
I've entertained the thought of a world occupation idea before (especially in EU3 where you could massively reduce the supply of goods and make crazy money from large scale occupations) but the "occupied" malus need to be broken somehow.