Many "scaling Agile" efforts have failed for lack of focus on delivering working software on a regular basis, instead just refactoring the processes to gather requirements. It is easy to ignore tooling, development and down-to-the metal DevOps practices when talking about scaling Agile. However these can be a boon or a bane to achieve Working Software, i.e., tested software, and as with any process implementation, Agile at Scale is no different.