And being able to control the actions of your party isn't immersion breaking? If you think about it any turn based game or game that gives you control over multiple characters can be argued as immersion breaking. The world operates in real time, and you can only control yourself, which is quite contrary to some games. Also RTS games have nothing people can relate to unless they were some general in the army, and even then generals won't relate to the fact their troops are replaced minutes after their previous units have perished. Most RTSs don't acknowledge gender either, and specifically say "Spend blah to train blah at blah. Blah is weak against blah, but are strong against blah. Their special ability is that they can blah."
You are the only person I have ever heard of to complain about an inclusion of a female PARTY member in a party based rpg. Even in Mass Effect you're forced to customize your female squad members along with their skills. Granted you weren't forced to make the character at the start of the game, but you were still forced to accept them into the squad.
If you have such a problem with the whole situation then:
A) don't continue arguing on the forums and leave, as the chance for your wish to remove the female protagonist will not come true, as the same sex alternative still involves you to control another main character's interactions. Divinity is attempting to put a twist to the norm of RPGs by having two main characters whose fates are parallel and intertwined, and if you don't like it, go play Skyrim. No one will miss you.
B) roleplay as the male character, which is what I plan on doing. Think of the female character as your vision of the perfect woman and use that as an excuse of covering her existence up.
C) don't role play at all and consider yourself more of a tactician or a narrator for the story