Longer bottom time to reach the no-deco limits. With a lower rate of N 2 absorption, divers can extend their bottom times to the no-deco limits. This can be helpful if a diver has a specific task to perform at depth. That 25 minutes can be important to a working diver. There are three major considerations.
Most divers dive a very safe profile anyway.
If the profile is inherently safe, you really don't add safety by using Nitrox. It is the profile that approaches a no-deco limit on air that can be made safer using Nitrox. Second, many divers like to extend their bottom time by any method available. It really doesn't matter how long it takes to get to a no-deco limit. Once you get there, you are there.