It's the Boeing 787 that has these, by the way. I think part of it was weight and size savings, and part of it was just providing a better passenger experience.
The 787 also has some improvements over conventional aircraft. For example, usually your pressurization system in most passenger aircraft sets you at 8000 feet (~2500 meters) equivalent altitude. But the 787 runs at 6,000 feet, and it also humidifies the air. The result is less fatigue and less jet lag for passengers.
It's the Boeing 787 that has these, by the way. I think part of it was weight and size savings, and part of it was just providing a better passenger experience.
The 787 also has some improvements over conventional aircraft. For example, usually your pressurization system in most passenger aircraft sets you at 8000 feet (~2500 meters) equivalent altitude. But the 787 runs at 6,000 feet, and it also humidifies the air. The result is less fatigue and less jet lag for passengers.