Surely mold and water spray can be cleaned? The way it can from the million other fountains and waterfalls in WDW, including the one just at the next bridge underneath the Tomorrowland Terrace.
Vintage TL had waterfalls at the entrances, a waterfall at the Skyway, trees. In the distance, the large pond and waterfalls and lush vegetation of 20k. It humanised all that concrete.
Modern MK has twice as many guests, has replaced attractions with restrooms (the skyway stations in both TL and FL), cut trees and replaced its water features from the hauntingly beautiful mature modern architecture fountains for a toddler Splash & Pee area.