As is common, the usual cast of characters here disagree with anything that is not what they believe is correct and completely disregard real-world results as well as point to the owner's manual as the word of God as if disregarding the OM the day after you hit a specific time or mileage causes the car to blow up. That's not how the world works.
If a car is stopping properly and the pedal is not mushy (also indicative of air in the system) there's not enough water in the fluid to require a change. Unless it's also time to change brake pads and/or rotors, there's no need to do this service even if recommended in the manual.
Though, if you're under warranty and could be denied free service on the brake system, that might be a reason to do the service even if not necessary. Otherwise, if the brakes are working properly, they are working properly. Unnecessary service, even if cheap, is unnecessary service.