It is just a source for memes, jokes, and in turn advertisment.

Why?

I get grouped with opposing faction in Dominion PvAI/PvP and Brawl PvP! I think this should not happen.

Is the score/asset gain weighted by that unsegregated faction teams? Even if it is, there are still untallied events happening all the time like me as a Knight helping a Viking kill my own Knight on the other team. Let us break that down. I got 10 Kill assist points, Viking got 10 Kill points plus a streak bonus and maybe execution bonus, my ally got nothing and a timeout. How is my fighting in that battle helping the war? It isn't, why the hell am I playing then the whole menu is the faction war map.