I understand your indignation but I partly disagree with you. We are not discussing how real life modern borders should be or should've looked like, but the ability to take advantage of the game map's granulality in a way that it abilitates many border posibilities.
It's understandable that you take this matter so personal because the real history is often tragic, but we're talking about a PC game where each player will have his preferences, and right now those locations shapes hinders many players.
Also, the game isn't just 1337, but it spams for more than 500 years into the future. Due to location shapes being immutable during gameplay, its preferable from a gameplay perspective to allow dynamism instead of a 100% accurate portrayal of a certain region, Paradox already stated that they shall prioritize gameplay over history accuracy.
The region as a whole wont be destroyed by removing them and god forbid shape them after the first/second/third partition; because you, in your game, wont never allow it; but me, or anyone else, in their game, should be able to do it if wanted.
Every location in the planet in this game is just a prize to slowly conquer, that's the very purpose of a game like this.
I'll make sure to make Poland great in my Poland campaigns, but in a German campaign, I want to replicate it's historical imperial borders.
