Nothing is illegal about it, I'm just saying that in games our engines have tonnes of various containers, some of which don't work with a for each loop because

Nothing is illegal about it, I'm just saying that in games our engines have tonnes of various containers, some of which don't work with a for each loop because they require iterators to be implemented and we don't have them, or containers which are containers but which aren't actually meant to ever be iterated upon. Again, there's nothing wrong about foreach loops in general. I'm just saying that in my industry and in the engines that we work with even the "basic" features of modern C++ are frowned upon for <reasons>.