Portfolio Kanban is a vital tool for the strategy level because it allows decision-makers to have a visual understanding of all initiatives in the organization.  The information displayed can illuminate any bottlenecks and allow for decisions to re-allocate resources. 

Many people are confused about Minimal Viable Product. In MVP, it isn’t that non MVP features will never get done.  Just that the MVP features will come first. In other words, it avoids waste by giving priority to what is necessary.