Synthesizing the empirical findings presented in previous chapters regarding the relationship between the built environment and life satisfaction in high-density urban contexts, this concluding chapter evaluates the study’s contributions while critically reflecting on its limitations and proposing future research trajectories. It aims to provide a comprehensive evaluation of the research scope, methodological constraints, and policy relevance, particularly within the Chinese urban setting. Section 11.1 revisits and expands upon the study’s key limitations, delving into issues of geographical specificity (with a focus on Guangzhou’s central urban area), cross-sectional data constraints, methodological linearity, challenges in establishing causal inference, and variable selection within hierarchical data structures. Section 11.2 translates empirical results into actionable policy recommendations across national, provincial, and municipal levels, emphasizing the optimization of objective built environment elements and the enhancement of key mediating factors such as Perceived Environmental Quality and Social Capital. Finally, Section 11.3 outlines future research directions, advocating for multi-scale and multi-city analyses, methodological innovations—including machine learning and longitudinal designs—and theory development tailored to China’s unique urban and institutional contexts. This chapter not only contextualizes the study’s findings within broader urban policy frameworks such as China’s “people-centered urbanization” but also highlights the imperative for culturally and contextually sensitive approaches in urban well-being research.