Why are the devs still keeping the province warscore mechanic from EU4 in this game?

Does PWSC even represent any real life concept, or is it just an imaginary number devs added for balance so you can't conquer France in 1 war?
But then again, you can conquer the HRE in a similar timespan (if you ignore coalitions), because annexing 100 provinces from 10 nations simultaneously is possible, but annexing 50 provinces from 1 nation isn't. Because ????

Also, why does PWSC even apply to the entire world when it's balanced specifically around Europe?
I mean - it's obvious that you shouldn't annex France in one war as for example Austria, but in Asia there are multiple examples of a country annexing a large country quickly (AQ annexes QQ, then Ardabil annexes AQ; Mughals annex Delhi; Manchu annexes Ming; Ottomans annex Mamluks).

From what I've seen in the dev diaries, they're adding a special CB for uniting China that reduces warscore, but that's (imo) a really bad band-aid solution that doesn't address any issues with how PWSC works.

(pic unrelated)