"Female models in Assassin creed? But that would double the workload."
"MGS V NOW WITH HORSES THAT POOP IN REAL TIME!!!!!!1111oneoneone"
America, ladies and gentlemen.
Disclaimer: Neither game actually being made in America except small chunks of Unity.
Ubisoft are just damn lazy, they've got half a million people at about a thousand different studios working on Unity and they can't even spend a little time to work on at least making the customization morph to a female figure, hundreds of games have done it before, many more will do it in the future.
Most games just use a slightly scaled down male skeleton and replace or tweak a small number of animations to give it some femininity by adding a wiggle to the walk animation or sexing up the idle poses.