[SapphireSun]

It depends on what you're trying to achieve. US Government sites aren't about creating an artistic experience. It's more important that digital services are delivered consistently and give citizens a good UX. As an experience, the design hinges on creating trust, accessibility, and being able to carry what you've learned about the interface to different sites. These things won't degrade easily with time. For instance, the significance of the color blue won't change rapidly (barring a large scale invasion by blue extraterrestrials).