Author:  Azamat Bek Affiliation:  Independent Researcher Abstract The Lean Startup paradigm—centered on build–measure–learn cycles, validated learning, and minimum viable products (MVPs)—has shaped a generation of entrepreneurial practice. Yet a decade of diffusion into both startups and incumbent firms reveals mixed outcomes: while teams learn faster, many struggle to cross the chasm from iterative discovery to repeatable, scalable growth. This article revisits Lean Startup