You can likely use the women's team in tournament mode against other women's teams. Even if you cant, many people will still use them in play now mode and have a ball with them.
Just because a featured doesnt interest you doesnt mean its useless. For example, I have no interest in FUT. Zero. But I understand that other people love that feature so you dont hear me saying "Why is FIFA focusing so many resources on FUT when there are bugs and glitches in the game."
Many people will check out FIFA 16 just because of the women's teams so I dont begrudge them for adding the teams. I'd guess that more people will play with the women teams than any of the missing international teams like Ghana, Bosnia or Algeria.