Athletic is a very complicated trait. In the early game it is BY FAR the best trait if you can get it at a Mythic level. It remains very strong until around level 300 when it will start to fall off. If you still have Athletic on at level 300, you’re fine. To be safe, it’s generally best to start taking Athletic off of your characters around level 400. If you make it to 440 you’ve gone to far. Replace it with anything else at that point.