I don't know why people are looking to video games for trenchant social change mechanisms. It's a business and they clearly had no interest in doing anything else other than pandering with the inclusion of female operators. If you don't like it, don't buy the game. The amount of people who won't buy this game due to lack of racial options is insignificant and clearly activision knows that internet SJW's arent going to buy the game anyways.
Even if they did allow character customization, you always end up with stuff like Dark Souls where people make horribly racist characters. Alternatively, you could have one black, one white, one chinese, one japanese, one egyptian, one french, one argentinian, one mexican and one iraqi operator, and then people would criticize you for not having transgendered operators or not having a character who is a 7th day adventist instead of an episcopalean. This shit never ends.