Agile and Lean both contained good ideas, but they've been misinterpreted. "Flexible processes" became "no processes", "rigorously test your assumptions" became "try things at random".

Web and mobile are becoming mature platforms. There's now a long history of web and mobile products to study - the design, engineering and business principles for success in these products should be well-known. They're not because of the rampant ADHD and short-termism in the industry.