YIMBYism (Yes In My Backyard) advocates for increased housing density and infrastructure development to combat the negative impacts of NIMBYism (Not In My Backyard). The comments highlight the need to shift the U.S. approach towards favoring development and innovation, especially in critical areas like high-speed rail. The struggle against NIMBYism in various projects, particularly in California, underscores a broader systemic issue where economic growth faces resistance regardless of potential benefits. Comparisons to cities like Shenzhen point to a disparity in urban development and the real consequences of stagnant policies, including social issues like homelessness in urban areas.