I get the purpose of this from a design standpoint, but it's missing 3 important perspectives.

Mobile view: in the past 10 years, mobile has taken over most web traffic. These pretty desktop views are only seen by a small percentage now.

Heatmaps: all that UI looks pretty, but without correlating conversion rates they won't perform. I would like a "Show Us Your Heatmaps" collection. How visitors actually use these pages is usually disappointing to marketing managers and designers, but crucial to stakeholders.

Dynamic Design: one important use of machine learning and A/B/n testing is the ability to deliver tailored landing pages to viewer within different contexts. Aren't we already at the point where a mobile Twitter user could see a completely different UI than a desktop Google search visitor?