Will Critchlow discusses the impact of user experience (UX) as a ranking factor in SEO, emphasizing its correlation with organic search performance and the complexities surrounding its acceptance. He highlights various methodologies for assessing UX, including clickthrough rates and algorithm evaluation, suggesting that while UX is aligned with Google's goals, the implications for ranking remain contentious. Critchlow advocates for integrating SEO and conversion rate optimization through testing to enhance overall effectiveness.