The number of vents are necessary because of how hot the monitor gets at max brightness. And they have to be distributed along the entire panel. There is even a fan that will spin up.
Not a design choice, unfortunately.
Most people make the mistake of thinking design is what it looks like. People think it’s this veneer – that the designers are handed this box and told, “Make it look good!” That’s not what we think design is. It’s not just what it looks like and feels like. Design is how it works.
— STEVE JOBS