Well, from a tech standpoint, id pretty much rolled their own whenever given the chance--Epic was more than happy just to buy middleware and slap it onto their

Well, from a tech standpoint, id pretty much rolled their own whenever given the chance--Epic was more than happy just to buy middleware and slap it onto their tech. There's also a different focus: Epic put a lot of work into making their engine accessible and well-tooled to other parties (though at times it didn't seem like it). Id? Not so much.