I'm not even a Sonya fan/player, but she's literally the first lady of MK. Why are people outraged and/or shocked that she would be in the game? NRS aren't gonna make her "sit one out" because of some plotholes about her being too old or that she has a daughter. They literally brought back several characters that died in MK9 with 'what if they were still alive even though they obviously aren't' costumes in MKX.
And those trying to stress "but she was OP in MK9 and MKX!" Have a day off. Namco didn't drop Jin Kazama from Tekken 5 because of his competitive fuckeries in the previous game(s).
She's still an extremely marketable character, which is why the proposition of Ronda Rousey voicing her is probably happening in the first place.