Our job as SWEs is to convert the vertical slice of functionality into something that fits well and robustly in the various technical layers that need to be touched.

The process that I outlined above explicitly creates the space for SWEs to consider the wider implications of the required changes in the architecture and make robust.

Part of that is understanding what the roadmap is and what is the product vision in the mid term, so that the tech layer can be built, step by step, towards what fits that vision.