[Zigurd]

Agile is very susceptible to being trapped in a local optimum. Breakthroughs in performance, for example, often require new architectures and/or new algorithms. Breakthroughs in user experience require throwing out a lot of existing iteratively improved UX. Two week sprints, and a "product owner" that is a kanban board accountant will not get you to the peak two valleys away.

Strong product management that can advocate for significant change, and that works with strong technical leadership that hasn't been worn down by being evaluated on Agile "velocity" (which, since story points are unitless, is just the inverse of time), is crucial to breaking out of a local optimum.