On most classes, most of their skills are neither cast nor hold so all out attack is a niche engraving that works great for very specific cases.
If you randomly happen to be such a class and spec I can see why you would be asking this. but for most people all out attack would affect 1-2 of their skills at most ~
Thank you kindly for your replies. Being a Sharpshooter, this engraving is not bad, because I use several skills with holding skills. At least I would use this till I can max out Grudge