You don't necessarily "need" carbs before a workout. Not only do I not eat carbs preworkout, but I don't consume anything but BCAAs. I train fasted every workout and have for a long time. Intermittent fasting is very popular for a reason. I feel no difference with or without a meal before a workout. Actually I have a much more productive workout in a fasted state. If consuming carbs preworkout is what you want to do then that's great, but its certainly not "needed"